Song Kang-ho as Dong-jin

Shin Ha-kyun as Ryu

Bae Doona as Yeong-mi

Im Ji-eun as Sister

Han Bo-bae as Yu-Sun

Lee Dae-yeon as Detective Choi

Gi Ju-bong as Engineer Peng

Kim Se-dong as CEO

Lee Yoon-Mi as Boss

Ryoo Seung-bum as Person with Cerebral Palsy

Ji Dae-han as Detective Ji

Heo Jong-su as Detective Heo

Nam Byung-hoon as Man 1

Park Jae-woong as Man 2

Jeong Gyu-su as Doctor 1

Lee Jeong-wook as Doctor 2

Lee Geum-hee as Radio DJ

Ryoo Seung-wan as Chinese Delivery Man

Lee Kan-hee as Dong-jin's Ex-wife

Jung Jae-young as Husband of Dong-jin's Ex-wife

Kim Ik-tae as Laborer 1

Oh Kwang-rok as Laborer 2

Shin Jung-keun as Laborer 3

Park Chan-wook as Bus Passenger (uncredited)