Devil Returns to School Days

Excellent grades, good looks, above average fighting skills, and a sense of justice. A first-class model student, Hyunsung Kim was pushed off a rooftop just before his graduation and became a vegetative patient. For ten years, he endured hellish days with only his hearing and consciousness intact, yet unable to die, he suddenly returns to the day when the bullying began.

(Source: Naver Corporation, translated)