The new school year brings with it a provocative new female student. When Pol does not return due to family pressures, Merlí has a conversation with his father.

Merlí and Coralina, the new director, get off on the wrong foot. Marc tries to help his younger brother with his behavioral and academic problems.

Joan asks Merlí for relationship advice, but instead, Merlí receives good advice from Joan. Tensions between Oliver and his mother escalate.

Merlí tells her mother a shameful lie. Things quickly heat up between Gerard and Oksana. Attracted to her new boss, Pol confides in Bruno.

Millán tells Glòria a secret he has been hiding. Tània speaks bravely to defend Berta in Coralina’s class.

When Pau is punished for throwing a pen at a bad teacher, Tània’s help brings Marc closer to her. Pol and Miriam have a heated confrontation.

A substitute teacher comes to the school and causes a change of mind.

Mònica gets tired of Joan’s jealousy. Gerard discovers what Oksana is busy with every afternoon. Oliver reveals a painful memory to Merlí.

Three students decide to play a joke on Coralina, but this causes them and two of the girls to receive a punishment that ultimately results in a very rewarding experience.

Coralina casts suspicion in Ivan’s mind about his mother and encourages Bruno to move to Rome. Joan tries to convince Mònica to change her mind.

Gina forces Gerard to face the realities of dating Oksana. Pol apologizes to Ivan. Marc takes Pau to visit his mother at work and makes a plea.

Joan decides to stop being the "good guy" and try new things. Oliver makes an announcement to his parents. Bruno says goodbye to those closest to him.

Pol discovers that his brother is keeping a secret. The students sneak into the school at night and have a wild Christmas party. Karma reaches Coralina.