A Gangster Became a High SchoolerHigh School Return of a Gangster; 조폭인 내가 고등학생이 되었습니다; A Gangster Became a High Schooler; I Am a Gangster Who Became a High School Student

"My dream is to enter college." Kim Deuk-pal, an uneducated man whose lifelong wish was to attend school, dies in a car accident while trying to save Song Yi-heon, a boy who jumped off an overpass while driving, on a rainy day. 'I hope that little thing lives.' When Kim Deuk-pal wakes up and finds out that the real Song Yi-heon tried to kill him due to school bullying and outing, he decides to take revenge and goes to the high school of his dreams. However, Choi Se-kyung, Song Yi-heon's unrequited love, begins to suspect Song Yi-heon "You're not Song Yi-heon."