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Jung Jae-young

Kim Sang-nam

Yu Seon

Na Joo-won

Kang Shin-il

Vice Principal

Jang Ki-bum

Cha Myeong-jae

Kim Hye-seong

Jang Dae-geun

Cho Jin-woong

Charles

Kim Mi-kyeong

Principal Nun

Lee Hyun-woo

Kim Jin-man

Ji Il-ju

Oh Chul-jin (uncredited)

Kim Dong-young

Jo Jang-hyuk (uncredited)

Son Seung-won

Park Choong-nam (uncredited)

Kim Ho-won

Goon San High Baseball Team

Chan-Hyeong Jo

Choong Joo Sung Sim School Baseball Team, Lee Cheol-Seung