Merlí tells his mother a shameful lie. Things heat up fast between Gerard and Oksana. Finding himself attracted to his new boss, Pol confides in Bruno.
3 students decide to play a joke on Coralina, but it causes that they and two of the girls receive a punishment that at the end results in a very rewarding experience for all of them.
Pol learns his brother is hiding a secret. The students sneak into the school at night and have a wild Christmas party. Karma catches up with Coralina.