설경구

Kang Ho-chang

Chun Woo-hee

Song Jung-wook

문소리

Gun-woo's mother

Oh Dal-su

Do Ji-yeol

고창석

Teacher Jung

강신일

Principal

성유빈

Kang Han-gyeol

남기애

Gyu-beom's grandmother

Lee Mi-eun

E-den's mother

Yoo Jae-sang

Gun-woo

Jung Yoo-ahn

Yoon-jae

정택현

E-den

Roh Jeong-eui

Ji-ho

정승길

Police

Lee Bong-gyu

김성오

(uncredited)

Choi Sun-ja