Kang Chan transfers to Myungsung High School in Busan from Seoul. Tough students at his new school hear the rumor that Kang Chan fought against 17 other students in Seoul. New student Seo Jae-Woo also transfers to Myungsung High School. He came from the same high school as Kang Chan.
| Actor | Role |
|---|---|
 Lee Ji-hoonKang Chan | Kang Chan |
 Kim Jin-wooSeo Jae-woo | Seo Jae-woo |
 Seo Ji-hoonJo Tae-woong | Jo Tae-woong |
 Choi Sung-minKim Sung Min | Kim Sung Min |
 Yu Oh-seong[Teacher] | [Teacher] |
 Son Dong-hwaSon Dong Hwa | Son Dong Hwa |
 Jeong Ji-hwan[Shuttle student] | [Shuttle student] |
 Han Eun-seongSeong Ho | Seong Ho |
 Moon Yong-il[Shuttle student] | [Shuttle student] |