Kostya is an unusual charming guy who doesn't know much about the world around him. Lech is a street artist who thinks he understands everything about this world. The friendship between them is a pure accident. But it is she who will turn their ideas about the world upside down. Every day Kostya and Lech will discover new facets of life to each other and others. And Kostya will carefully turn every amazing discovery into a letter and send it to a person he doesn't even remember the last time he saw — his mother.