Lee Byung-hun as Seo In-woo

Lee Eun-ju as In Tae-hee

Yeo Hyun-soo as Im Hyun-bin

Hong Soo-hyun as Yeo Hye-joo

Namkoong Min as Kim Chul-sung

Lee Jae-yong as Kwak Yoon-jung

Im Jae-geun as Kim Jin-tae

Lee Beom-soo as Lee Dae-geun

Kim Min-jae as Kim Min-jae

Jang Suk-won as Cho Jae-Il

Jeon Mi-seon as In-woo's Wife

Ki Joo-bong as Director of Student Affairs

Park Cheol-min as P.E. Teacher

Kim Kap-soo as Professor of Sculpture

Oh Ji-hye as Substitute Teacher of Korean

Woo Jung-kook as Courier

Lee Seok-ku as Supermarket Owner

Kim Jung-young as English Teacher

Hwang Hyo-eun as Sculpture Schoolgirl

Lee Soo-young as Class President