For the people coming here thinking this drama will be cute, it is not. There is a side couple kind of cute but overall, the atmosphere is heavy as it highlights fights, actions, bully, harassment, injustice, corruption, school, gangs, and FIGHTS. This kind of atmostphere is exactly what I enjoy, it shows how life really is.
The action/fight scenes were impressive. And I like when fights are more realistic, if they completely exagerrate the fights I will loose interest but in this drama it is fine and I was very surprised Sehun truly were amazing at fighting scenes. The main character truly suits Sehun, cold, cool and warm at the same time. The cast honestly was very good, I like the skill of the "small" guy "Kim Jong Il" he became my favorite character of this drama alongside Hyuk (Sehun). The osts were good but I was expecting better osts but it was not bad. Also with this kind of drama, it is possible to re watch it without being bored. And that plot twist at the end I was absolutely not ready !

Overall it was a pleasant surprise, I hope a season 2 will come soon !