Semyon Treskunov as Kolya Smirnov

Anastasiya Bogatyreva as Ksyusha Dronova

Konstantin Khabenskiy as Papa Koli

Irina Denisova as Mama Koli

Mikhail Efremov as Vladimir Dronov

Irina Pegova as Dronova

Aleksandr Pal as Станислав Ильич (учитель информатики)

Tatyana Dogileva as Zavuch

Vasiliy Butkevich as Spicha

Sofya Shidlovskaya as classmate Kolya

Evgeny Rybov as man 1

Aleksandr Stefantsov as detective

Oleg Sokolov as Pisun

Andrey Karasevich as Dima

Svetozar Golovlev as man 2

Aleksei Karnaukhov as Long-Eared Boy

Lev Semashkov as bully

Anastasiya Somova as gymnastics teacher

Sofya Shidlovskaya as Kolya's classmate

Alexandra Kiseleva as Kolya's classmate

Ieva Andrejevaitė as Alisa Denisovna - uchitel angliyskogo yazyka