Sol Kyung-gu ( 설경구 )

Kang Ho-chang

Chun Woo-hee ( 천우희 )

Song Jung-wook

Moon So-ri ( 문소리 )

Gun-woo's mother

Oh Dal-su ( 오달수 )

Do Ji-yeol

Ko Chang-seok ( 고창석 )

Teacher Jung

Kang Shin-il ( 강신일 )

Principal

Seong Yu-bin ( 성유빈 )

Kang Han-gyeol

Nam Kee-ae ( 남기애 )

Gyu-beom's grandmother

Lee Mi-eun ( Lee Mi-eun )

E-den's mother

Yoo Jae-sang ( Yoo Jae-sang )

Gun-woo

Jung Yoo-ahn ( Jung Yoo-ahn )

Yoon-jae

Jeong Taek-hyeon ( Jeong Taek-hyeon )

E-den

Roh Jeong-eui ( 노정의 )

Ji-ho

Jung Seung-kil ( 정승길 )

Police

Lee Bong-gyu ( Lee Bong-gyu )

Kim Sung-oh ( 김성오 )

(uncredited)

Choi Sun-ja ( Choi Sun-ja )