Ilse, the English teacher, wants the class to write about their childhood. Marifer and Memo are in charge of the homework papers, but Marifer is only focused on Alex and Rafa. Memo convinces Alex to be honest, and Marifer breaks up with him. Marifer and Memo turn in the assignments, but Ilse suspects they're all too similar. Memo tells Marifer about his dark side, who admits she has one too.

Alex hangs out with Rafa, and his relationship with Marifer wavers. At school, the bullies go after Memo, and Alex stops selling them “merchandise." Diego, extremely popular, makes sure no one buys homework from them. Memo and Tenoch intervene, but Diego warns them that Alex will replace them. Alex talks to Memo about his crush on Rafa. Alex is about to kiss Rafa, but Marifer interrupts.

The gang goes to a party. Marifer gets drunk and flirts with Lalo, a skateboarder. Alex avoids his snobbish ex-friends. Daniela sees Diego with his girlfriend, and Tenoch realizes there's something between them. Only Memo has fun drinking. Susana, Alex's sister, kisses Tenoch. Everything ends with Marifer fighting with Alex, revealing to everyone that he likes Rafa. Alex feels abashed.

The school wonders if Alex is gay. Marifer is treated as the resentful girlfriend, so she flees to Lalo. Tenoch wants Daniela to choose between Diego and the business. Thanks to Memo, Daniela also makes Diego choose between her or Mariana. Diego and Daniela have sex. Thinking Diego chose her, Daniela leaves the business reluctantly. Her sister consoles her, encouraging her to be independent.

The only ones left in the business are Tenoch and Memo. Daniela is their new competition. Also, teacher Ilse wants them to stop. Tenoch decides to retire after pulling off an exam heist. Diego annoys Tenoch by saying he's gay, too, so Tenoch mocks Alex in front of others to come out unscathed. Meanwhile, Alex confesses to Rafa that he likes him, but Rafa only wants to be friends.

There's a newcomer at school, Memo. The only ones who take pity on him are a group of knowledge traffickers who sell assignments and homework. The group is in the middle of a small crisis. Alex and Marifer, who've been dating for a while, are going through a difficult time. She wants to have sex but he doesn't because he likes Rafa, a guy who works at his family's video store.

Memo learns he will move to the USA. He invites Alex, Tenoch, Marifer, and Daniela to his house. The relationship between everyone is tense, but Memo brings out his karaoke machine, and they start having a good time. Memo thanks Alex for getting him into their group. Alex heads home, but he remains uneasy. When he returns to see Memo, he sees an ambulance. Memo wanted to say goodbye to them.

Memo killed himself. Alex breaks down at school. Everyone says they feel bad for Memo, but no one will miss him. The dreaded exam arrives, but the answers Tenoch sold are not useful. He's about to get beaten up. The band intervenes. Reflecting on Memo unites them. They consider restarting the business and encourage Alex to talk to Rafa. They kiss. The ending is happy but uncertain.