- Yoo Joon-sang
- Lee Sang-hoon
- Hwang Jung-min
- Im Deok-gyu
- Yun Je-mun
- Sin Jae-seok
- Lee Yo-won
- Hong Kyu-min
- Seo Beom-sik
- Choi Joong-man (Turtle)
- Han Cheol-woo
- Head of Sadang High School students
- Park Doo-shik
- Sin Jae-seok (young)
- Park Jeong-min
- Young Im Deok-gyoo
- Park Ji-hoon
- Pro athlete Jeong Sang-ho
- Jung-Hyuk Lee
- Son Jin-Ho (Young)
- Ho-sam Seon
- Seoul Action School (Past)
- Kang Seong-jin
- Announcer
- Kang Shin-il
- Director Jo
- Joe Thomas
- Various
- Ji Woo
- Lim Soo-bin
- Jeong Woong-in
- Son Jin-ho
- Kim Young-ok
- Mother-in-law
