Thirty-year-old worker Oldřich Olejník is a pub and wine bar worker, because he is celebrating the birth of his son. It is no wonder that he ends up in the detention center. This is how he meets seventeen-year-old Jirka Kouba. The troubled young man, who was nicknamed Žluťásek because of the color of his favorite T-shirt, left his job after numerous conflicts. His father disappeared for no apparent reason and his mother could not cope with it. Therefore, Žluťásek spends most of his time in a gang led by the bankrupt actor Ancek. Oldřich, in whom paternal qualities have awakened for understandable reasons, begins to take an interest in and care for Žluťásek. In addition to breaking through Žluťásek's initial distrust, this will also mean getting to know Ancek and his dubious gang...
