정우성

Do-chul

Lee Jung-jae

Hong-ki

이범수

Byeong-guk

한고은

Mimi

Park Ji-hoon

Seong-hoon

이기열

Mr. Moon

Han Sang-mi

Hong-ki's Mother

Park Seong-woong

Byeong-guk's Man

김영호

Boxing Trainer (uncredited)

권태원

Man (uncredited)

Lee Bong-gyu

Lender (uncredited)

최선중

Doctor