演职人员
Pyotr Vinogradov, inventor
Борис Ливанов
Senya Kaufman
Valentin Tsishevskiy
Kotya Okhotnikov
Константин Градополов
Valya, music student
Galina Pashkova
Tonya, architecture student
Nadezhda Ardi
Physical education instructor (uncredited)
Иван Переверзев
Senya's mother (uncredited)
Татьяна Барышева
Red army sailor (uncredited)
Всеволод Санаев
Young girl (uncredited)
Галина Степанова
Professor (uncredited)
Сергей Антимонов
Spectator at the concert (uncredited)
Ева Милютина
Middle aged woman (uncredited)
Мария Ключарева