Leonid was born 16 years later after his older sister Lyudmila. He sometimes suffers from excessive care of her and the parents. The boy wants them to reckon with him as an adult. But the only one who does it is Ivan, Lyudmila’s groom. But he goes on a long trip. When he returned and said Leonid that he met another woman. Now, the hero will have to make a real adult act - delicately notify sister. He understands that the later you grow up, the fewer problems you will meet in your life.