The premise is that I am always arrogant but don't know it... People will have some problems, suspicion, lying, selfish... But don't know it. After doing something crazy, he would say that he was possessed by a devil, and he would use this to excuse himself. I said that if there really is a hell, why not let the ghosts and gods be obsessed with a demon and drag those dirty souls into the depths of hell to wash them out.
(Also, one chapter is a complete story, and the location does not affect viewing)