黄渤

Dawang

荣梓杉

Xiaotian

陈思诚

Mozart (voice)

黄杨钿甜

Ding Jieling

姚晨

Niu Yuxia

范偉

Grandpa Xiaotian

贾冰

Teacher Deng

许君聪

Scarface

梅婷

Ren Xiaotian's mother

Lang Lang

Lang Lang

黄觉

Ding Jieling's father

于洋

范湉湉

Xue Xihao's mother

桑平

Ma Yuan's father

Yang Jinci

Twins' father

Li Mingxuan

Police

李澤宇

黃星羱

Ouyang Baoluo

于波

[Mo Mo's father]