Kim Deuk Pal is a 47-year-old gangster, who is the #2 guy in his gang. He doesn't have an educational background due to his poor parents, but he has a dream of attending a university. He has been studying to achieve his dream, but it's not easy. One day, he sees a young man, Song Yi Heon, about to kill himself. At that time, Deuk Pal's spirit possessed the body of the suicidal 19-year-old high school student. Deuk Pal soon learns that Yi Heon is a victim of bullying, which has caused him to want to take his own life. Now, Deuk Pal, in the body of Yi Heon, takes on the bullies to punish them and becomes friends with classmate Choi Se Kyung. Se Kyung is a model student who appears to be in a perfect situation, but he suffers from domestic violence at home by his father.

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Kim Deuk Pal es un gángster de 47 años, que es el número 2 de su pandilla. No tiene formación académica debido a sus padres pobres, pero su sueño es asistir a la universidad. Ha estado estudiando para lograr su sueño, pero no es fácil. Un día, ve a un joven, Song Yi Heon, a punto de suicidarse. En ese momento, el espíritu de Deuk Pal poseía el cuerpo del estudiante de secundaria suicida de 19 años. Deuk Pal pronto se entera de que Yi Heon es víctima de acoso, lo que le ha hecho querer quitarse la vida. Ahora, Deuk Pal, en el cuerpo de Yi Heon, se enfrenta a los matones para castigarlos y se hace amigo de su compañero de clase Choi Se Kyung. Se Kyung es un estudiante modelo que parece estar en una situación perfecta, pero sufre violencia doméstica en casa por parte de su padre.