Tekfur Alexis of İnegöl seeks revenge on the Kayı tribe for conquering Kulucahisar. He invades a caravan of the Kayı tribe, Osman, takes his revenge by defeating him in a battle. After the battle, the Emperor, concerned over the Turk threat on his empire, sends Aya Nikola to İnegöl Castle. Nikola kills Alexis for his failure and snatches the castle from him. Nikola also frees an old friend from prison, Flatyos. Ertuğrul also later returns towards the end after a year in Konya.

Nikola arrives in the nomad camp and claims he wants peace while Osman thinks he is about to meet his father but falls into an ambush set by Yavlak Arslan, Hazal Hatun's brother. Meanwhile, Osman's elder brother, Savcı, also returns from Crimea. Ertuğrul goes to meet Arslan Bey of the Çobanoğlu tribe and warns him not to become a traitor as he's dealt with them his whole life. Osman, who escapes Arslan's ambush, ambushes him and Geyhatu's son, Möngke's camp. However, Arslan and Möngke escape.

Arslan tasks Cerkutay, who is alive, to go to Geyhatu, who already hates him because of him being loyal to Balgay, and tell him that Osman captured Möngke. Geyhatu, who is in Konya planning to kill his brother, Argun, is angered over this and allows Cerkutay to live if he is loyal to him. Meanwhile, Söğüt perishes due to the disease spread by Flatyos on the orders of Nikola followed by an explosion done by the same people.

The relations between Savcı and Osman become tenser, Osman is angered when Ertuğrul sends Savcı to explain to Geyhatu that Osman didn't kidnap Möngke. When Savcı arrives at Geyhatu's camp, he is given only a few days to find Möngke otherwise his tribe will be destroyed. After Savcı tricks one of Cerkutay's men into telling him Möngke's location, he falls into Möngke and Arslan's trap and is captured. Möngke seeks to kill his father to become the Viceroy and then the Great Han while pinning the blame on Osman.

The time period given by Geyhatu ends and Geyhatu arrives in Osman's tribe. Osman saves Savcı and he returns to the tribe with the captured Möngke. Ertuğrul continues to stay on his death bed.

Möngke's treachery is proven after he is forced to reveal the truth, however, he doesn't manage to say the truth about Arslan thus Arslan survives and Möngke is killed by Geyhatu. In the meantime, Aya Nikola and Flatyos successfully capture Kulucahisar Castle.

Osman is alerted that a distant Cuman Turk tribe has been invaded by the Emperor and the Bey's daughter, Targun, is being taken captive. Osman rescues Targun and takes her to the tribe. However, Targun is betraying Osman, she spies for Aya Nikola to save her father, İnal Bey, who is in Aya Nikola's captive. Hazal also teases Bala that Targun was brought by Osman because he wanted to marry her for a child which she couldn't produce.

After Nikola is stabbed by Osman, Flatyos attempts to take revenge on Osman with a gunpowder plot on Söğüt. Osman however, is aware of the attack and Flatyos' plans backfire. Flatyos is captured and is taken to Kulucahisar where the "incompetent" Dündar and Savcı are saved by Osman who were about to be beheaded by Nikola.

Targun goes to meet her father at Kulucahisar but is spotted, when she returns, Osman captures her and she is forced to tell the truth. Osman vows to help her save her father and also decides to marry her after Bala says that he needs an heir to become the Bey. He also attacks Kulucahisar while Nikola goes to meet Arslan at the Çobanoğlu tribe.

Osman reconquers Kulucahisar, although İnal Bey is taken by Nikola's knights to İnegöl. Bala and Targun's relations tensen a little and Dündar's evil plans are also revealed, he seeks to become the Bey of the tribe.

The tensions escalate further upon the death of Argun, who was killed by Geyhatu, and Geyhatu's visit to Tabriz in order to become the Han of the İlhanlı (transl. Ilkhanate). Nikola vows to ally with the powerful Geyhatu in order to destroy the Turks. Ertuğrul also recovers and stops Savcı from becoming the Bey (which is a part of Dündar's plans) while Yavlak allies with Osman to help him against Geyhatu.

Targun and Osman make a plan to kill Nikola and rescue İnal Bey in which they succeed in rescuing İnal but fail to kill Nikola and only injure him. Ertuğrul dies just before he could announce that Osman is the new Bey.

The tribe elections are held to decide the new Bey. Dündar comes face-to-face with Osman however, Osman is elected as the new Bey much to Dündar's despair and anger. Meanwhile, a new threat against the Kayı tribe emerges after Petrus, sent by the Pope, arrives to help Nikola kill Osman but also has a secret plan which he doesn't tell Nikola about. Bayhoca, Savcı's son, also returns.

After a series of events including Bala being poisoned by Targun, Targun and Göktug are exiled, which is part of Osman's plans. Dündar has a meeting with Nikola which Osman is aware of resulting his beating when he returns. Petrus' real plans are also revealed, he wants to know what the Turks of Anatolia are planning by seizing some scrolls.

Dündar and the Kayı make a trade deal with Tüccar Melik and Süleyman (Simon and Petrus), Ertuğrul comes in Osman's dream reminding him of his will for his second marriage and Nikola is made the "Tekfur of Tekfurs" while his army from Constantinople, led by Alexander, is destroyed by Osman in a great battle. Alexander survives.

Bala seeks to marry Aksu Hatun to Osman as per Ertuğrul's will, although Aksu is Hazal's adoptive daughter and unknowingly ends up working in her devious schemes. The Kayı flag is also changed by Osman along with Bayhoca being captured by Nikola after a series of events.

Going against his loved ones' advice, after Savcı is tricked and wounded by Flatyos, Osman agrees to surrender Kulucahisar in exchange for Bayhoca. However, he makes a plan and re-conquers the castle immediately after surrendering it, killing Alexander. Meanwhile, a desperate Lena seeks her former lover Flatyos' help, angering Savcı. İdris, Petrus' spy in the Kayı, also begins to set a trap for Bamsı on Petrus' orders, whilst Göktug and Targun return and offer Flatyos an alliance.

As the allied enemies, Nikola, Targun and Petrus continue to stir traps for Osman, Targun ambushes Bala while İdris leads Bamsı into a trap set by Aya Nikola in order to seize the scrolls with Osman's plans for Anatolia. When Osman is alerted, he sets out with half his alps to find Bamsı, only to fall in Nikola's trap and have his tribe pillaged by Targun for the scrolls and a failed attempt by Dündar to become the Bey. Aksu is also killed by Targun before she can confess to Bala about Dündar and Hazal's misdeeds.

Göktuğ helps Bala defeat Targun in a trap, with Bala eventually killing her. Meanwhile, Osman is saved from Nikola's ambush by Malhun Hatun, a woman requesting Osman for some land for her tribe of 1000. As Malhun settles in the tribe, she questions Osman about his plans. Göktug is made leader of the Cuman Turks, whilst Petrus and Simon demand compensation from Osman for allegedly being attacked. İdris is caught as a spy by Osman, although he is killed by Dündar before he can reveal his treachery.

Osman goes after İdris' killer, but Dündar is saved by Petrus. Meanwhile, Göktuğ learns that Nikola is travelling to Constantinople, and sends word to Osman. Dündar later allies with Petrus and reveals Osman's intentions to ambush Nikola whilst he is on his journey. Meanwhile, the cynical Malhun discovers Dündar's thumb ring, having been dropped when he was in Söğüt, and attempts to find the traitors in the Kayı. As Osman's ambush is foiled by Nikola after learning of it from Petrus, Bayhoca is shot and wounded by Flatyos.

Osman and his alps are forced to retreat from the battle, whilst Bayhoca later dies from his wounds. Flatyos is soon captured by Osman, and is taken to the Kayı tribe in order to make him reveal the traitor in the tribe. However, on Dündar's urging, Savcı and Lena kill Flatyos to avenge their son, inadvertently covering Dündar's tracks. Meanwhile, Petrus allies with Geyhatu's commander Togay, who arrives seeking to annihilate the Bayındır and Kayı tribes.

Togay, revealed to be Baycu Noyan's son, attacks a meeting of Turkmen Beys chaired by Osman in Söğüt, wounding Ömer Bey. Seeking to sow discord amongst the Turks, Togay frames the Dodurga Bey İvaz Bey for the attack, although his innocence is later revealed. Meanwhile, Lena, having given birth to a son named Ertuğrul, accepts Islam with the help of Şeyh Edebali. Suspecting Dündar's treachery, Osman attempts to set a trap for Dündar and Togay, although Dündar outwits Osman, causing Togay to attack and wound Malhun.

Osman captures Suci, one of Togay's henchmen. However, Suci is also Cerkutay's blood brother and friend, compelling Cerkutay to save his friend, leading to the tribe believing that Cerkutay is a traitor. Cerkutay, actually serving Osman, later helps the Kayı attack Togay's forces. Meanwhile, a recovered Malhun is sent by her father to İnegöl to ally with Nikola against Togay, although she is captured in the castle by Togay, who has allied with Nikola. Osman also captures Nikola's ally Tekfur Aris, seeking to ally with him, although Togay delivers an ultimatum to surrender the Tekfur in exchange for Malhun.

Osman decides to use Tekfur Aris as bait to trap Nikola. However, Togay kills Aris on the way, providing Nikola with an excuse to keep Malhun in captivity. Nikola also kills Zülfikar Derviş, Osman's spy in İnegöl. Nikola also releases Malhun to gain the support of Ömer Bey, who seeks to sell him horses in order to infiltrate and conquer the castle. The sale of horses angers Osman, who orders them to be seized. Meanwhile, Togay ambushes some of the Kayı on the way back from Boran Alp's unfinished wedding, wounding Gonca Hatun and killing Abdurrahman Gazi.

After Togay leaves for Konya, his fellow commander Camuha arrives. After Nikola learns Camuha's whereabouts from Dündar, he informs Osman, leading to a successful ambush, although Camuha escapes. Meanwhile, Osman attacks the incoming Kalanoz, younger brother of Kalanoz, after learning of his arrival indirectly from the Mongols, killing many Byzantine soldiers. He invites all Turkmen tribes to join the attack except the Bayındırlı, angering Ömer Bey. Şeyh Edebali later calls Osman and Ömer Bey to Söğüt to resolve their differences, leading to Ömer Bey handing over Dündar's ring to Osman, exposing Dündar as a traitor.

Dündar flees from Söğüt after being exposed as a traitor, and takes refuge with Nikola in İnegöl. The revelation that Dündar is a traitor infuriates Gündüz and Savcı and saddens Aygül. Meanwhile, Petrus and his right-hand man Simon attempt to kill Hazal to cover their tracks, but are stopped by Osman Bey and are captured, with Hazal put under house arrest. Osman sends Gündüz as a messenger to İnegöl and offers a ransom for Dündar, although Nikola declines and demands more gold via Ömer Bey. Eventually, Osman uses Simon to lure Dündar into a trap, capturing him.

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Due to the pressure of the Mongols, Tekfur Yason imposes heavy taxes, causing the people of Yarhisar to take shelter with Osman Bey. Nikola also finds out about Simon and Petrus being captured by Osman and kills Simon after realising Osman is using him. Refusing Togay's demand to turn over the refugees, Osman Bey causes the Byzantine-Mongol alliance to be re-established. While Togay plans a major operation against Kayı Tribe, Malhun Hatun, who wants to take Osman's side in this war, confronts her father, Umur Bey.

Osman Bey confronts the Byzantine-Mongol army with the support of Malhun Hatun. In the ensuing battle, Savcı Bey is stabbed by Kalanoz in the back and dies, which prompts Osman Bey to kill Kalanoz in revenge. Nikola, who gathers troops from the local landlords, plans to raid Umur Bey’s tribe in response to Malhun Hatun's participation, whilst Umur Bey, decides to exile his daughter for fighting against his will. Looking for ways to break the Byzantine-Mongol alliance, Osman Bey agrees to pay taxes to the Mongols, surprising everyone. Togay, who is strengthened by the lands given to his command, plans to turn this situation into an opportunity to consolidate his domination in the region.

Osman Bey's expulsion of the ambassador who comes to the tribe to receive the tax causes Togay to break his truce. This causes the Seljuk Sultan, Mesud II, to summon Osman Bey to Konya to punish him in order to protect him from the wrath of the Mongols. Learning that Osman Bey refused to pay taxes to the Mongols from a spy in the tribe, Nikola takes action to increase his influence by taking advantage of the Mongol-Turkish war. Bamsı Bey also kills Petrus after Osman realises Simon was killed by Nikola. Cerkutay, on the other hand, becomes a Muslim under the witness of Sheikh Edebali. Umur Bey develops a plan to attack Togay, which is opposed by Osman. After a confrontation between the pair, Sheikh Edebalı tells Osman Bey that he must marry Malhun Hatun in order to gain the support of Umur Bey and achieve the goal of uniting the Turkish tribes.

After Sheikh Edebalı intervenes and prevented a possible conflict between Osman Bey and Umur Bey, Umur Bey stands down. Meanwhile, Nikola takes action to destroy the truce between Osman Bey and Togay, with Osman's plan to trap Togay being ruined. While Osman Bey, sends Göktuğ as an envoy to Togay to ensure he remains loyal to the agreement; Sheikh Edebali takes on the task of persuading Umur Bey about marriage. Osman Bey, on the other hand, explains to Bala Hatun that he decided to marry Malhun Hatun after consulting with Sheikh Edebali.

Umur Bey and his alps are captured by Togay after ignoring Osman Bey's order not to launch an attack. Meanwhile, Togay's commander Camuha raids the vulnerable Bayındır tribe with his sentries, with Malhun Hatun and a handful of alps battling to defend the tribe. Later. Umur Bey, left alone and trapped by Nikola, regrets his failure. Osman Bey, who takes immediate action to heal the wounds of Umur Bey, holds Umur Bey to account for disobeying his command.

A wedding ceremony is set up in Kayı Tribe for the marriage of Osman Bey and Malhun Hatun. While the wedding is being held, Bala Hatun grieves despite her consent to this marriage. With the arrival of the winter season, after the wedding ceremony, it is decided that Kayı tribe will migrate to Domaniç Plateau. While preparations continue in the tribe, Togay breaks the agreement and decides to attack Osman Bey, despite the warnings of the Mongol governor Yargucu. In the ensuing battle, Togay kills Bamsı Beyrek after a fight.

After Bamsı Bey's martyrdom, Osman Bey takes an oath to avenge him. Togay, meanwhile, develops an alliance with Nikola and establishes a large army to strike a last blow to the Kayıs. Togay, who enlarges his army with the soldiers he receives from Nikola, stands against Osman Bey and his alps in the battlefield. However, Nikola withdraws from the battle after having a prior agreement with Gündüz Bey, although Governor Yargucu arrives and takes Togay into custody.

After Osman lures Togay from custody into a trap, he captures and beheads him in Söğüt. The abduction and execution of Togay angers the Governor Yargucu, who subsequently demands Kayı Tribe pay a three-year tax within three days. Yargucu also forms an alliance with Nikola. Later, Malhun Hatun reveals to Osman that she is pregnant and Göktuğ's lover Zoe is revealed to be serving Nikola.

Osman Bey takes action to prepare for a war he will wage against the Byzantine army led by a commander named Dukas. Osman goes to Konya to meet with the Seljuk sultan, whilst Governor Yargucu, plans a move against Osman Bey. Increasing his power with the arrival of Commander Dukas in İnegöl with his army, Nikola thinks that he has the opportunity he is looking for to drive the Turks out of the edge. Bala Hatun, who learns that Osman Bey will have a child, tries to control her feelings and takes a step towards Malhun Hatun. Osman Bey, on the other hand, goes to battle with Dukas' Byzantine army.

Before the battle, Osman raids the Byzantines and seizes ammunition, before going to battle with the support of Turkmen and Seljuk forces. During the battle, Dukas and local Tekfurs are killed by Osman's forces, with Nikola and Helen escaping alive, and Turhan Alp being martyred. Meanwhile, Zoe tries to poison the pregnant Malhun Hatun but is caught and arrested. After the battle, Osman's son Orhan is born, whilst Bala reveals to Osman that she is pregnant and Osman decides to establish a state after visiting the Aksakals.

Osman Bey, now leading a state, aims to unify the Turks under his banner, and influence border principalities. Bayhan Bey and his rival Begüm Hatun attend Osman Bey's wedding, possibly revealing intentions towards his daughter, Fatma Hatun. The arrival of the Caliph's vizier Emir Ömer stirs tension, his purpose unknown to Osman. Emir Ömer secretly informs Karesi Bey of the theft of sacred relics, prompting Karesi to seek them out and offer allegiance to Osman Bey. As Osman expands his territory, Byzantine hopes rest on Commander Lucas, who holds the sacred relics and plots against the Turks. Lucas tries to recruit Holofira, impacting her and Orhan Bey’s paths. Alaeddin Bey is imprisoned in a castle as Osman continues his conquests, facing Lucas's schemes.

Despite numerous challenges, Karadin Castle becomes Kayı property. Alaeddin Bey is exposed to danger during the conquest. Commander Lucas devises a plan to find and exploit the weaknesses of Osman Bey and Karesi Bey, aiming to set them against each other. Lucas, holding sacred relics, plans to use them as leverage. Osman Bey's tribe is alarmed when the relics are stolen, and he confronts Lucas. The fight for Karadin Castle ensues with Begüm Hatun and Bayhan Bey vying for control, while Bala Hatun remains disinterested. Holofira, under Lucas's orders, arrives uninvited at the celebration, rekindling her love with Orhan Bey, who proposes marriage. Saruca and Yusuf compete for Fatma Hatun's affection. During Gonca Hatun's difficult childbirth, Begüm and Hazal Hatun clash, with Begüm accusing Hazal of poisoning her.

Osman Bey's pledge to protect the sacred Islamic relics elates the Kayı tribe but fuels Karesi Bey's jealousy. To thwart Osman, Lucas sets a trap in Karadin, complicating Begüm Hatun's situation. After her setback, Begüm plots to undermine Bala Hatun. Meanwhile, it's revealed that Cecilia poisoned Gonca Hatun, straining her relationship with Holofira. Orhan Bey devises a plan to kidnap Holofira from her arranged marriage, but they encounter a trap. Lucas and Karesi plan to financially damage Osman by building a bridge. Osman discovers Karesi's deceit. The unfolding drama sees Gonca's feelings towards Holofira change, and the possibility of Orhan and Holofira's reunion.

Osman Bey's escape angers Lucas and Karesi Bey, who plan a new move against him. During a wedding in Kayı Oba, Lucas incites a Greek rebellion in Söğüt, shocking everyone. Lucas also pressures Karadin Castle, putting Osman Bey in a tight spot as he deals with both threats. Osman Bey escapes a trap, while Orhan Bey and Holofira face danger from Lucas' men. With no obstacles left, Osman Bey plans a grand wedding for Orhan and Holofira. Tensions rise between Gonca Hatun and Holofira due to lingering pain. Begüm and Hazal Hatun notice the strain and may exploit it. Gonca Hatun considers leaving Kayı Oba with Alaeddin Bey. Yusuf and Saruca vie for Fatma Hatun's affection, leading to a showdown between them.

Osman Bey rewards Karesi Bey with Karadin Castle for thwarting Lucas's plan to capture it, initiating trade despite Karesi Bey's potential hidden motives. Meanwhile, Osman Bey tackles the escalating Greek Rebellion in Söğüt, aiming to restore peace by targeting its leader, Arcadeus. Sofia teams up with Lucas to seek revenge, severely injuring Baysungur, pushing Osman Bey to focus on avenging him. In the Kayı Obası, tensions rise between Gonca Hatun and Holofira, drawing Hazal and Begüm Hatun into the conflict. Bala Hatun intervenes with impactful warnings, while her strained relationship with Begüm Hatun adds to the discord.

Osman Bey prepares to strike Byzantium and Karesi Bey by targeting Akhisar, while Karesi Bey enforces martial law in Karadin to strengthen his grip. As Osman Bey focuses on his conquest, Bala Hatun works to maintain peace amidst rising tensions between Gonca and Holofira, further aggravated by Begüm Hatun. Meanwhile, Sofia creates turmoil by kidnapping Fatma, Saruca, and Yusuf, shocking Söğüt Pazar. Bala Hatun swiftly takes action to rescue Fatma and restore order.

Osman Bey is deeply disturbed by the kidnapping of Fatma Hatun, Saruca, and Yusuf by Lucas and Sofia, who demand Söğüt in exchange for Fatma. Though appearing to surrender, Osman Bey devises a plan to rescue her without losing Söğüt. Meanwhile, Karesi Bey, sensing Osman Bey's vulnerability, declares war and allies with Gencer Bey to strike. Lucas manipulates Yusuf and Saruca to uncover Osman Bey's strategies, testing the loyalty of Begüm Hatun and Bayhan Bey. Amid rising tensions, Orhan and Alaeddin take great risks to rescue Fatma, further intensifying the conflicts.

Sofia seeks revenge on the Kayis by orchestrating a deadly trap, endangering Bala Hatun and leaving Gonca Hatun and Holofira's fates uncertain. Lucas suspects a traitor in their ranks and uncovers Ilbay, who faces the threat of execution. Tensions rise as Boran and Cerkutay blame Begüm Hatun and Yusuf for their struggles, further fueled by Begüm's disruptive actions in the council and market. Bala Hatun steps in to address the escalating discord, while Gonca Hatun must navigate the delicate revelation of Begüm Hatun's love for Osman Bey.

Osman Bey seeks justice for the attack on Bala Hatun and his family, while Sofia sets a trap involving Osman’s long-lost daughter Halime, whom she raised as an enemy. Tensions rise as Poena unknowingly attacks her sister Fatma at Söğüt Market. Suspecting Gencer, Begüm, or Bayhan as traitors aiding Lucas, Sofia, and Karesi, Osman monitors them closely. After discovering Begüm Hatun's meeting with Karesi Bey, he imprisons her, but she escapes and seeks refuge with Karesi, who proposes to her. Osman tracks Begüm's kidnapper, confronts Karesi Bey, and blood is shed in the process. Amid all this, Osman Bey is determined to protect his family and take revenge against Lucas and Sofia's growing threats.

Osman Bey, wounded by Poena’s arrow while seeking Sofia’s hidden secrets, remains resolute in defeating Sofia and Lucas, who scramble to escape while managing Poena. Sofia plans to use Poena to infiltrate the Kayı Tribe and target Osman Bey and Bala Hatun. During Bala Hatun's visit to Halime's grave, Poena attempts to kill her. Amidst growing tensions, Karesi Bey declares war on Osman Bey with Lucas’s support, while Begüm Hatun risks her life by warning Osman of Karesi’s plans. Sofia and Lucas launch an attack on Osman’s headquarters, threatening Bayhan Bey’s life and impacting the war’s outcome. Osman Bey must face Karesi’s alliances and stand alone against mounting threats.

Osman Bey besieges Akhisar Castle, confronting both the Mongols, who devastate Turkish tribes after he refuses their tax demands, and Sofia, who seeks revenge with Lucas's support. As massacres unfold, Osman Bey remains focused on his conquest despite mounting threats. Poena supplies Sofia with vital camp information, complicating Osman’s plans further. Amid escalating tensions, Bala Hatun addresses the Mongol envoy, while Osman devises strategies to prevent massacres, outmaneuver Sofia’s traps, and achieve victory—all relying on his leadership and tactical brilliance.

The Mongol Commander Ulugan challenges Osman Bey at the Kayı Tribe, threatening his reputation and life, while the Mongols brutally torture Prince Orhan in Karacahisar, forcing Osman to plan his rescue. A poison spreads through the tribe, endangering lives, including Poena’s, as Alaeddin Bey seeks an antidote and Bala Hatun fears losing Poena without knowing she is her daughter Halime. Amidst these challenges, Osman Bey tightens defenses against the Mongols, while Ilbay devises plans to undermine them, leaving the tribe to navigate multiple critical threats testing their strength and unity.

Ulugan's poison wreaks havoc on Osman Bey's lands, forcing Osman to sacrifice himself and surrender to save his people. While paraded as a trophy in captivity, his resolve remains unshaken. Within the Kayı tribe, Bala Hatun confronts Begüm Hatun over her disruptive actions stemming from her love for Osman, while Begüm counters Ilbay's betrayal with a surprising move. Orhan Bey, saved from execution, now embarks on a mission to rescue Osman. Amidst the turmoil, Holofira reveals her pregnancy to Bala Hatun, offering a glimmer of hope, but a raid by Ulugan's forces threatens their fleeting joy.

Osman Bey escapes execution at the last moment, but the Kayı tribe faces a life-or-death struggle due to the Mongol-Byzantine alliance and Ilbay's betrayal. Ulugan announces Ilbay Bey as the new lord of the Kayıs, leaving Osman Bey enraged and vowing revenge. Ulugan decides to execute Osman Bey in front of the Kayı tribe but changes his mind and takes him on a dangerous journey instead. Osman Bey escapes with Poena, who reminds him of Halime. Bala Hatun, Orhan, and Alaeddin plan to save Osman Bey but fall into a trap set by Sofia, Lucas, and the nokers. Osman Bey, Bala Hatun, and Poena are trapped on the edge of a cliff, where Poena takes a big hit during their fight with Lucas and the nokers.

Osman Bey rallies to reclaim his losses and confronts his enemies, with Yusuf and his alps joining his cause. While Bala Hatun and her allies support him, Begüm Hatun, driven by revenge, opposes Bala. Yusuf and the alps are captured by Lucas, who plans Yusuf's execution in the arena to weaken Osman Bey's resolve. Osman Bey acts swiftly to rescue them, facing peril as he confronts Lucas, Sofia, and Ulugan in the arena to defend his people and thwart their plans.

Osman Bey aims to reclaim Söğüt from Ulugan, restoring hope among his people and setting an unexpected trap for his foe. Meanwhile, Cerkutay and his son Gazi are captured, leaving their fate uncertain and causing distress for Ülgen. Sofia escalates tensions by capturing Bala Hatun, leading to a confrontation with Begüm Hatun, who sets fire to Bala's hut. Osman Bey rescues Bala but is consumed by a deep desire for revenge after witnessing her dire condition.

Osman Bey is devastated by the treacherous martyrdom of Bala Hatun and vows to live only for her revenge. He learns that Begüm Hatun burned the hut and sets out to find Begüm and İlbay. Bala Hatun's martyrdom deeply affects the Kayı people and her children, Alaeddin, Fatma, and Orhan. Osman Bey stops Bala Hatun's burial preparations in Söğüt, deciding she will be buried in the Kayı tribe next to her child Halime. As Osman Bey prepares to take back the tribe, he mobilizes all resources against the numerically superior Ulugans and İlbay. Great dangers await Osman Bey and his army as they strive to reclaim the Kayı tribe and seek justice for Bala Hatun. Meanwhile, Poena, who witnesses these events, is struggling to remember her past and is confused as she gets to know the Kayı people.

Sofia continues to torment Bala Hatun in captivity, while Halime, having overheard Sofia's conversation, confronts her. Bala Hatun, now certain her daughter is alive, plans her escape to reunite with her. Osman Bey, lacking proof of Bala's survival, learns from Halime/Poena that she is alive. Determined, Osman sets out to rescue Bala, but Sofia moves her to a hidden monastery, posing yet another obstacle as Osman fights to reunite with Bala and their daughter.

In the Kayı tribe, joy returns with the reunion of Bala Hatun and the arrival of Ramazan, even as Osman Bey and his people face the growing threat of Ulugan and Ilbay, who conspire to weaken his power by turning other beys against him. Amidst the joy, Bala Hatun focuses on capturing her enemy Sofia, ultimately bringing her to the camp. Meanwhile, Osman Bey faces a bloody struggle against Ulugan, who, with external military support, corners him and endangers his loyal alps, leaving the tribe to fight against treachery and ambition while holding onto their unity and faith.

Esenbike Hatun's dramatic arrival at Kayı Oba creates tension as she demands a hefty tax from Osman Bey or threatens to claim his daughter Fatma for her son Sargun. Osman Bey, resolute in protecting his family and people, devises a risky plan to escape this predicament while avoiding conflict with Olcaytu. Meanwhile, Bala Hatun, determined to find her daughter Halime, captures Sofia and stakes everything on negotiating her release in exchange for Halime’s whereabouts, uncovering a potential truth about Poena's identity.

Osman Bey, determined to uncover Esenbike Hatun's true intentions, invites her to a secret camp while confronting Ulugan's ambush with his loyal Alps, ultimately forcing Ulugan to kneel at swordpoint. Meanwhile, Bala Hatun, with Alaeddin Bey and Gonca Hatun's help, follows Halime's trail to uncover her identity as Poena, but faces the challenge of protecting the nun holding this secret. As Esenbike Hatun plots to isolate Osman Bey by seeking alliances with Turkmen lords, Osman Bey devises a strategy through Ulugan to counter her scheme and secure his position among the Turkmen Beys.

Osman Bey exposes Esenbike's treacherous scheme with Ulugan, prompting Esenbike to declare hostility and rally allies for a major attack. With the Turkmen Beys on his side, Osman Bey strategizes to reclaim the Kayı Tribe and defeat his enemies despite threats from all directions. Meanwhile, Bala Hatun seeks to heal a nun she saved, hoping to uncover the truth about her daughter Halime's whereabouts. Alaeddin Bey creates medicines to aid the nun's recovery, raising questions about whether Bala Hatun will realize Halime is closer than she thinks, and if Poena will recognize Halime’s identity.

Osman Bey reclaims his tribe and establishes a new order, gaining the loyalty of influential Turkmen lords like Hasan Alp and Koca Bey, but faces growing threats from within and outside. Kuçar, Olcaytu Khan's ambassador, demands Osman Bey's children as compensation for deaths he didn’t cause, while Commander Gladius, allied with Sofia, arrives with a treacherous plan to defeat him. Amid external pressures, internal tensions escalate between Princes Orhan and Alaeddin, threatening the dynasty's stability. Sofia targets Halime in her latest scheme, but Halime, armed with the truth, prepares to confront her, adding complexity to the already turbulent situation.

Osman Bey faces a heartbreaking decision that tests his loyalty to his state and his love for his children, shaking the tribe's balance. Meanwhile, the escalating rivalry between Prince Orhan and Prince Alaeddin threatens the unity of the tribe, also straining Cerkutay and Boran Bey's relationship. As tensions rise, Osman Bey’s enemies seize the opportunity to act, with Kuçar and Claudius scheming a dangerous plan that demands Osman Bey sacrifice his own kin. Amidst the chaos, Osman Bey and Bala Hatun reunite with their long-lost daughter Halime, who is trapped in turmoil, teetering on the edge—both physically and emotionally—as she faces a life-altering decision.

The Kayı tribe faces mounting trials as Halime’s tragic fall off a cliff leads to turmoil, Sofia and Bala Hatun clash over blame, and Alaeddin and Gonca are held captive by Kuçar with Gonca's fate hanging in the balance. Amid sorrow, Holofira's conversion to Islam brings joy, as Orhan Bey plans to confront the Kuçar threat to save Alaeddin and Gonca. Meanwhile, Osman Bey battles Claudius and Kuçar, navigating dangerous alliances and traps while striving to protect his family and tribe from further loss, including Fatma Hatun, pursued by Begüm Hatun. Despite the threats, Osman Bey's resilience fuels his efforts to outwit his enemies and safeguard his people.

Osman Bey's strategic agreement with Sofia stirs conflict among the beys, raising doubts about trust and unity within the tribe. Meanwhile, Kuçar plots to isolate Osman Bey and exploit Hasan Bey's departure to incite chaos, and Claudius devises a coup threatening the fragile alliance between Osman and Sofia. As Bala Hatun and Halime embark on a perilous journey to find Alaeddin and Gonca, Alaeddin risks everything to save Gonca from Kuçar's ruthless schemes. Amid the shadows of captivity, Orhan Bey faces challenges that could either mend or deepen the rift with his brother. With his children's lives in peril, Osman Bey sets out on a bold mission, seeking both rescue and revenge, aiming to deliver a decisive blow to his enemies, Kuçar and Claudius.

Osman Bey prepares for conquest, seeking strategic gains in İznik while tensions rise within his enemies’ alliance. Turgut Gazi’s return sparks anticipation, and Bala Hatun inspires warriors with faith and unity. Meanwhile, Kuçar plots revenge, and Begüm Hatun falls into Bala Hatun’s trap, setting the stage for the next clash.

Osman Bey’s sudden council decision shakes the tribe as he prepares for conquest, alarming Byzantium. The Emperor sends Claudius and Sofia to counter him, while Yiğit Bey secretly allies with Claudius. Amid rising tensions, Osman confides in Turgut Gazi, Bala Hatun assigns a mission to Halime and Fatma, and Sofia renews her schemes. As Osman marches with his army, Claudius sets a trap that threatens his campaign.

Osman Bey swiftly establishes a headquarters in Göynük upon learning of Claudius' defensive preparations in Mudurnu, suspecting a traitor among his ranks. Meanwhile, Claudius fortifies Mudurnu, anticipating Osman’s arrival, while Sofia incites rebellion in Göynük, forcing Osman Bey and Bala Hatun to fight on two fronts. During a brutal confrontation, Sofia critically wounds Halime, shaking Osman and Bala to their core. Despite enemy schemes, Osman successfully conquers Mudurnu, only to face Claudius’ final hidden trap, threatening the peace of the newly claimed territory. The fate of Mudurnu and Osman’s forces now hinges on his ability to counter this treacherous move.

Osman Bey fiercely battles Claudius and the Roman army, successfully repelling Byzantine forces despite shifting power dynamics. However, threats persist as a traitor still lurks within the tribe. Meanwhile, Yiğit, blinded by ambition, plots to assassinate Bala Hatun and even turns against his own brother, Koca Bey. Claudius, consumed by hatred, launches a vicious attack on the Kayı tribe but ultimately falls into Osman Bey’s grasp, facing his wrath. Sofia, driven by vengeance, meets her end in a final confrontation, executed before the tribe. As Osman Bey prepares to shake Anatolia with his grand ambitions, he continues to inspire hope among the Turkmens.