In the center of the plot is an exemplary husband and exemplary father Oleg. His life is measured and planned for years to come. But fate has its own plans: the young beauty daughter Alyona falls in love with the once best friend and peer of her father Anton, with whom they are united not just by friendship in the distant past, but by a stormy youth in all respects. So stormy that Oleg prefers to keep it a secret even from his family. As a loving father, Oleg is simply obliged to prevent the union of his only daughter with an immoral type, whose past makes him the worst candidate for son-in-law in the world. Anton continues to live that reckless life that both lived 30 years ago, but Alyona seems to like just such guys.

Seventeen-year-old Artyom is invisible in the family and a rebel in the technical school. He has a best friend, Kostya, and they do all the provocations and tricks together. When the management of the technical school compiles an unofficial list of dangerous teenagers - "explosives", Kostya, by pure chance, falls into the first place, which makes him popular among other students. Kostya revels in interest in himself - and betrays his friend, convincing his classmates that he, Kostya, is the main and only inspirer of all their antics. Then Artyom decides to prove who the “number one bomber” is really here. But on his way, a girl, Kira, unexpectedly appears, who is able to influence his dangerous plan.