Ji Yunhe possesses the rare ability to tame demons, but she is confined to the Demon Valley by strict imperial laws. Her life takes an unexpected turn when Chang Yi, a merman, is brought to her by a cruel princess. The princess orders Yunhe to give Chang Yi human speech and legs, forcing him to pledge loyalty. As Yunhe grows sympathetic toward the merman and falls for him, she longs to set him free. But helping him may come at a great cost, putting both their lives in danger.

In a world populated by powerful gods and warring mortals, two enchanted beings meet in a peace-filled realm: They are Su Mo, a prince of sea gods, and Bai Ying, a princess and descendant of a mighty sword deity. They are immediately attracted to one another and begin on a romance, unaware that they are effectively crossing enemy lines and sparking animosity between two warring factions. Their actions anger other deities and Su Mo is eventually expelled from the realm. Overcome with grief, Bai Ying attempts to put her existence to an end by jumping from a magnificent pagoda.

Tatsumi is a high school student who lives on his own, until a merman named Wakasa takes up residence in his bathtub. His solitary lifestyle is turned upside down by the self-centered (but handsome) new roommate.

A wealthy girl, An Xin’er, who accidentally gets fish scale skin and loves others wrongly, is trapped in chaos after being conformed. By chance, she is saved by the simple and kind Yu Sheng, and with his help, she cures the strange disease, walks out of the shadow, and writes a new life.

Gu Ze Yi, the merman prince, was captured by the human woman Lu Miao Miao. Gu Ze Yi started a long journey of "chasing the beads." His three brothers made jokes in order to help the eldest brother retrieve them.