Action

Free to read on Webtoon
The MC lives in a world where some people have hero like powers & others have villain like powers. He was a hero until he was betrayed by comrades & killed. Now he inhabits the body of a teenage boy with villain powers.
Cool action scenes & plot so far. The MC is morally grey/is a mix of anti-hero & anti-villain. I say this because he still has his heroic morals & tendencies but his villain power allows him to do much more violent things than before.

Jin Ja-Kang clan is massacred by the poison clans, being the lone survivor he is tortured and experimented on. Upon escaping he vows to avenge his clan and all the others who were killed