Cast & crew
Once Upon a Time in High School (2004)
Directed by Yoo Ha Written by Yoo Ha
Cast
| Seo Dong-won | Hun |
| Kwon Sang-woo | Moo-hyeon |
| Lee Jung-jin | Hyun-woo |
| Han Ga-in | Ju-myung |
| Lee Jong-hyuk | Hoon |
| Park Hyo-joon | Ham |
| Kim Dong-young | young Bell |
| Cho Jin-woong | Board Member |
| Lee Gyu-ho | Gold Leader |
| Kim In-kwon | Jiksae |
| Baek Bong-ki | Cheetah |
| Ahn Nae-sang | Teacher |
| Kim Beong-choun | Sam |
| Kwon Tae-won | Teacher |
| Cheon Ho-jin | Jenny's Father |
| Lee Hyeon-seok | Hyun-woo |
| Jun Sung-ae | Jong |
| Yang Han-seok | Teacher |
| Park Soo-young | Teacher |
| Kim Bu-seon | Boniface |
| Lee Jang-woo | Black Student |
| Baek Joo-hee | Black Student |
| Lee Geon-moon | Overseas Korean |
Crew
| Kim Jun-seok | Original Music Composer |
| Noh Jong-yun | Producer |
| Kim Byeong-gi | Special Effects Supervisor |
| Kim Kyung-tae | Production Sound Mixer |
| Kim Ki-chul | Production Design |
| Tcha Sung-jai | Executive Producer |
| Pil Gam-seong | Assistant Editor |
| Choi Hyeon-gi | Cinematography |
| Yoo Ha | Screenplay |
| Yoo Ha | Director |
| Sin Jae-myeong | Fight Choreographer |
| Kim Seo-young | Makeup & Hair |
| Lee In-gyu | Sound Designer |
| Choi Sun-joong | Producer |
| Park Gok-ji | Editor |
| Jun Kyoum-soo | Stunts |