설경구

Kang Ho-chang

Chun Woo-hee

Song Jung-wook

문소리

Gun-woo's mother

Oh Dal-su

Do Ji-yeol

Ko Chang-seok

Teacher Jung

Kang Shin-il

Principal

성유빈

Kang Han-gyeol

남기애

Gyu-beom's grandmother

이미은

E-den's mother

Yoo Jae-sang

Gun-woo

Jung Yoo-ahn

Yoon-jae

정택현

E-den

노정의

Ji-ho

Jeong Seung-gil

Police

Lee Bong-gyu

Kim Sung-oh

(uncredited)

Choi Sun-ja