Wishing to show that they live well together, and prove her independence to the adults, Lena puts into play her ingenuity and charm and gets part-time work as a postman.

Literally on the very first day of work late in the evening, a stranger (Andrey Andreyev) clad in a trenchcoat and hat, whose face she did not have time to see, protects Lena from hooligans and gives her a handful of chewing gum.

Lena's friend Ira offers to test this admirer's devotion by forcing him to buy her roller skates.

When she leaves, Lena discovers that the mysterious admirer was a witness of their conversation, and the next day it turns out that Marina is in a hospital in crippled condition.

However, she wants him to reveal himself to her, which the admirer does not intend to do and at some point Lena on the phone says that she hates him throws away the beautiful handkerchief she found in the post box.