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.

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.