Kim is expelled from his eighth school and finds himself at Volcano High where students fight to possess a treasured ancient document. Kim, who must resist from using his Chi, is caught in the middle.
| Actor | Role |
|---|---|
 Jang HyukKim Kyung-soo | Kim Kyung-soo |
 Shin Min-aYoo Chae-yi | Yoo Chae-yi |
 Kim Hyeong-jongShimma | Shimma |
 Byun Hee-bongJang Hak-sa | Jang Hak-sa |
 Huh Joon-hoMr. Ma | Mr. Ma |
 Gong Hyo-jinSo Yo-seon | So Yo-seon |
 Kim Soo-roJang Ryang | Jang Ryang |
 Kwon Sang-wooSong Hak-rim | Song Hak-rim |
 Cho Seong-haKorean Language Teacher | Korean Language Teacher |
 Seo Beom-sikAthletics | Athletics |
 Jung Sang-hoonCon Cho | Con Cho |
 Yun Mun-sikPrincipal | Principal |
 Lee Yu-miKyung-soo's sister | Kyung-soo's sister |
 Park Dong-binMusic teacher | Music teacher |
 Shin Cheol-jinChinese teacher | Chinese teacher |
 Jung Won-joongSchool Nurse | School Nurse |
 Jo Sang-geonKyung-soo's father | Kyung-soo's father |
 Kim Il-wooHead of Student Affairs | Head of Student Affairs |