I have an idea and anyone who says it's too extreme should question why they're reading such a sick webtoon in the first place. I suggest she chloroform the shit hog, tie him up real good and either rape him Lisbeth Salander style or hire a group of men to gang rape him, film it, chop off his hands so he can't physically hurt anyone though he's a coward who has others do his dirty work, and then threaten him with the footage so he'll leave her and the world alone. If this doesn't work, kill him but only after he suffers what he's done to her.