When delinquency became a major problem in Korea they created a unique school to fix the problem. - http://www.batoto.net/comic/_/comics/ultimate-legend-kang-hae-hyo-r9812
Seemingly, Kang Hae Ho is a bullied child who is mistakenly sent to a "reform" school along with he tormentors, and all of the other delinquents in the area, including some of the best fighters among them.
This manwha got really interesting to me after the "big" reveal was made about why he got sent to the school, and the ramifications it has on his character.
Note: This is not an "oh no, how am I going to survive this situation" manwha if you get what I mean.