A spirit of a middle school dropout gangster who accidentally possesses an 18-year-old boy’s body who killed himself, goes back to high school to take a revenge against the bullies with his gangster skills and encounters unexpected relationship.
| Actor | Role |
|---|---|
 Yoon Chan-youngYi-heon/Kim Deuk-pal | Yi-heon/Kim Deuk-pal |
 Bong Jae-hyunChoi Se-kyung | Choi Se-kyung |
 Won Tae-minKim Dong-soo | Kim Dong-soo |
 Lee Seo-jinKim Deuk-pal | Kim Deuk-pal |
 Seo Tae-hwaChoi Myung-hyun | Choi Myung-hyun |
 Kim Se-wonKim Yeon-ji | Kim Yeon-ji |
 Joo Yoon-chanHong Jae-min | Hong Jae-min |
 Lee Kyung-youngThe Boss | The Boss |
 Shin Min-jaeMathematics Lecturer | Mathematics Lecturer |
 Lee Hee-jinSong Min-seo | Song Min-seo |
 Ko Dong-okJong Cheol | Jong Cheol |
 Choi Ji-hyeMin-ji | Min-ji |