Agui Deunggyo

Excellent grades, good looks, above average fighting skills, and a sense of justice.
A first grade model student, Kim Hyunsung 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, translated)