bro so evil he's even peak in somebody else's manhwa. he's cheon ma from nano machine btw

Wait really... I didn't even notice... What makes him cheon ma?

the storyline happened before the heavenly demon association was formed because he formed that school and association from scratch. it's also said from the novel that the "descendant" who gave cheon yw the nano machine asked cheon ma first (which is the mc) but he declined.