Mikhail Lvovskiy

The story of a ridiculous and ridiculous seventh-grader boy, whom no one seems to take seriously: neither teachers, nor peers. But then one day a new one appears in his class with which he manages to make friends . (imdb)

Klava and Seryozha (Sergey) have been together since preschool. When they are teens, Klava rejects his love because she knows that he doesn't value her for her, and instead is attracted to Lavrik. Klava likes him because for the first time she feels like someone is really interested in her as a person. Seryoszha, being very dramatic and wanting sympathy, writes a suicide note, "Please blame Klava K. for my death" (imdb)