Katrin humiliates her ex Ivan by kissing Martin and starts a fake relationship with him to provoke Ivan, but постепенно develops real feelings.
As tension escalates, Ivan attacks Martin, while Katrin pushes their relationship further, unaware that Martin is secretly with Daniel.
When the truth is exposed publicly, Martin admits who he is and chooses Daniel, leaving Katrin hurt.
On prom night, he still keeps his promise to her, showing that what they had was not entirely fake.