![High School Return of a Gangster](https://image.chilimovie.com/region2/en/300px/20240531/bK5kGsWq9vGALbDgPmNiLFNFVI1.jpg)
Deuk Pal found out that the school bullies reported Yi Heon for school violence. He orders Dong Soo and the gang to get Lee Mi Kyung since she is the one behind them. Byung Chul tells Jae Min to join him and report Yi Heon as well. Jae Min feels guilty about falsely charging Yi Heon, but he's also scared that he might end up going to the juvie if the truth is revealed.
Se Kyung witnesses Yi Heon getting abducted but can't do anything about it because he remembers Yi Heon telling him not to call the police about anything. He asks Jae Min for help, but Jae Min cowards out. Meanwhile, Yi Heon deals with the gangsters and tells them things that shock them.
Deuk Pal, now inhabiting Yi Heon’s body, arouses suspicion from Se Kyung due to his noticeable deviation from his usual self. Despite Deuk Pal's attempts to mimic Yi Heon's behaviour, the other kids begin to question the sudden change in him. Particularly with Jae Min persisting in ridiculing Yi Heon, Deuk Pal plots a subtle revenge for him.
Deuk Pal is about to become the boss of the Chilsung Gang. While mulling over giving up his dream of going to university, he tries to save Yi Heon from jumping off a bridge. Unfortunately, Deuk Pal loses his life but takes over Yi Heon's body. He learns of Yi Heon's misfortunes and resolves to avenge his suffering as a victim of bullying.
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.