정재영

Kim Sang-nam

유선

Na Joo-won

강신일

Vice Principal

Jang Ki-bum

Cha Myeong-jae

김혜성

Jang Dae-geun

조진웅

Charles

김미경

Principal Nun

이현우

Kim Jin-man

지일주

Oh Chul-jin (uncredited)

김동영

Jo Jang-hyuk (uncredited)

Son Seung-won

Park Choong-nam (uncredited)

Kim Ho-won

Goon San High Baseball Team

강우석