New student Javier starts school and meets the ever-observant Sofía. Another student's secret is publicly revealed, stirring up the school.

The anonymous hacker continues to expose more students' secrets, with far-reaching consequences. As friendships are tested, Sofía investigates.

Gerry's aggression toward Luis escalates. The hacker brings the situation to a boiling point. Sofía worries about the threats against her.

Sofía's stress about the hacker threatens to overwhelm her. Raúl throws a big, raucous party for all the students. Natalia desperately needs money.

Raúl and Javier struggle to get along as they help Sofía track down the kidnapper. Meanwhile, the hacker threatens to reveal everyone's secrets.

Javier's history is called into question when Raúl and Sofía look into a specific incident in his past. Gerry continues visiting Luis in the hospital.

A look back at the previous semester reveals the series of events that triggered the school-wide hack.

Quintanilla punishes a suspected student for the hacking. Rosita insists on throwing the school their anticipated NONA party, with many surprises.

An anonymous person seeks vengeance on behalf of Luis. Sofía must solve the first mystery in order to save two classmates before it's too late.

When a certain someone returns to school, chaos breaks out. Natalia rushes to solve her financial dilemma. The search for the avenger heats up.

Sofia and Javi try to predict what the avenger will do when Rosita insists on hosting a party at her house. Gerry feels cooped up at Raul's place.

Natalia's account of what transpired the night before sparks an argument between Javi and Sofia. Pablo struggles with the news about María.

Raul and Sofia try to find Gerry before the avenger gets to him. Desperate to raise money, Natalia tries an unorthodox dating app.

On the day of Quintanilla's goodbye ceremony, Sofia and Raul race to discern who the next victim will be. María attempts to help Natalia.

Sofía studies Luis' drawings to work out who the avenger is targeting next. Natalia and María accept an invitation. Rosita doesn't heed a warning.

Multiple people's lives are put in danger when the avenger makes a final desperate move, leading to devastating consequences.