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After the summer vacation, Sam is in for a big surprise: Klavdija is still part of the teachers' union, and tension immediately arises between them. He is just trying to hide that he spent the summer in America, but Klavdija also has her secrets. As a result of the fire at Tivoli Primary and Secondary School, Tretja Gymnasium gained quite a few new pupils, students and professors. Among the new students is Niko, who is on parole, and when tablets disappear from the school's storage, things quickly get complicated.

Sam's student Anja is a professional athlete who lives for marathon running. When she learns that she has suffered a chronic injury that will force her to give up sports for the rest of her life, she loses all will to live. Together, Samo and Klavdija encourage her to find a new life dream, but Anja initially refuses their help. Samo is still convinced that Klavdija is engaged to Juri, but he can't help but be constantly near her, just as she is near him.

The headmaster warns Klavdija that her student Lev is slacking off and is missing a lot in the class. He inadvertently finds out that Lev ran away from home after an argument with his father and spends his days and nights in a cramped, abandoned building. Klavdija and Samo set about solving Lev's problem, but clearly have different views on how to do it. Even social services get involved in the case, and no one seems to find the right solution for the homeless student.

Samo notices that his student Sofija is sickly getting worse. When she and Klavdija delve into the reasons for her low self-esteem, they quickly discover that she is in love with Luka, who Sofia's friends say is out of her league. Meanwhile, Samo and Klavdija decide to take a new step in their relationship and to begin with, they will test themselves primarily on a sexual level. But nothing goes as planned.

Samo notices that the troubled student Niko is behaving aggressively and strangely. In order to find out what is happening to Niko, he tracks him down and learns that Niko's mother is seriously ill. Out of grief, Niko makes a mistake that could cost him parole, but Samo won't let that happen. In order to save his student, Samo asks Klavdija for help, but she is scattered by her mother's visit.