Jung Jae-young
Kim Sang-nam
Acting
Yu Seon
Na Joo-won
Acting
Kang Shin-il
Vice Principal
Acting
Jang Ki-bum
Cha Myeong-jae
Acting
Kim Hye-seong
Jang Dae-geun
Acting
Cho Jin-woong
Charles
Acting
Kim Mi-kyeong
Principal Nun
Acting
Lee Hyun-woo
Kim Jin-man
Acting
Ji Il-ju
Oh Chul-jin (uncredited)
Acting
Kim Dong-young
Jo Jang-hyuk (uncredited)
Acting
Son Seung-won
Park Choong-nam (uncredited)
Acting
Kim Ho-won
Goon San High Baseball Team
Acting
Chan-Hyeong Jo
Choong Joo Sung Sim School Baseball Team, Lee Cheol-Seung
Acting