
I'm kind of surprised that this wasn't a manhwa, given how similar the style is...
Webtoons Link:
https://www.webtoons.com/en/challenge/deception-of-the-demon-king/list?title_no=218568

This is probably going to be an unpopular opinion but...I just want Dong Gyun to give up on Alex and find someone else to love because that's what I would do. I don't see the point in pursuing somebody who has made it clear since the start that they're only in it for the pleasure AND made you feel like shit several times over and over.
I get frustrated when I see him moping and getting his life style affected because of such an asshole. But this is a manhwa soooo MAKE HIM REGRET WHAT HE DID TO YOU, DONG GYUN.
Well...at least the basics of the reason why Sangwoo is so crazy has been revealed. But I still don't get why he kills other people?