Ultimate Legend: Kang Hae Hyo

Delinquency has become a major problem among the youth, especially the high school population. Taking the matter into their own hands, the government has created a special school just for these troubled youths. Kang Hae Hyo, a seemingly normal high school student who is bullied frequently, somehow ends up in the school! He's not sure he belongs there, but something him, and his past, may be discovered at this school...

(Source: MangaDex)