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.
EPISODE 1
Episode 1
A middle-aged gangster Kim Duk-pal is ordered by his boss to succeed him, giving up his dream to go to college; while driving with a troubled heart, he happens to save a suicidal teen, Song Ee-hun and wakes up in the boy's body.
EPISODE 2
Episode 2
Kim Duk-pal in Song Ee-hun's body learns that the boy has been bullied severely and decides to help him; but his weak body isn't as capable as Duk-pal's, and Choi Se-kyung, a classmate is suspicious about his true identity.
EPISODE 3
Episode 3
Duk-pal succeeds in beating up Jae-min, the bully and his friends, but he refuses to repent; Lee Mi-gyeong, Chairman Bae's secretary hates and despises Ee-hun and his mom and schemes to eliminate them.
EPISODE 4
Episode 4
Duk-pal narrowly saves Ee-hun's mom from being kidnapped and tries to find a way to deal with Mi-gyeong; Myeong-hyeon tries to control Se-kyung; Jae-min, who was almost involved in Min-seo's kidnapping, anxiously loiters around Ee-hun's house.
EPISODE 5
Episode 5
Duk-pal notices Dong-su who once was his right-hand-man has something to do with Mi-gyeong and orders to bring her to him; but it makes Dong-su suspicious.
EPISODE 6
Episode 6
Duk-pal takes a trip with Se-kyung who ran away from his step-dad; Se-kyung enjoys his newfound freedom with Duk-pal, doing things he never experienced before.
Yoon Chan-Young
Bong Jae-hyun
Won Tae Min
Seo Tae-hwa
Joo Yun-chan
Ko Dong-wuk
Lee Seongtaek
Ban Kwan-jun
Kim Mi-na
Jeong Da-hui
