Marina nicknamed ‘Mouse’, a good and modest girl, is a student of the conservatory. With the help of her mother, the famous actress Inga Belozerova, she gets to the best pedagogue – Nina Georgievna. Marina is charmed by her son Kirill, and soon the young people start dating.
But the secrets of the past arise on their way. They learn that there has been a love affair between their parents. Marina’s mother cheats on her husband with Kirill’s father. The two were in love twenty years ago and having met now they understood that their feelings were still alive.