To be honest, I agree that sangwoo is totally batshit crazy and as well as yoonbum however I don't really think the story really romanticized anything. In fact, although yoonbum is seen to be head over heels for sangwoo, the story doesn't really put either of them in good light nor does it really put any of the rape, murder or torture in that light as well. For me, I also saw both of these characters as extremely pitiful but I never sympathized them. I don't ship them, I don't think it's healthy and it really isn't supposed to be.
The author clearly doesn't romanticise any of the things you mentioned above and the manhwa too in anyway doesn't portray that (at least that's how I received it) . But it is true for some ppl who ship them(implying the issue of romanticism). Sangwoo is inhumane and an absolute psychopath and Yoon bum is ill (cmon the guy's a stalker , has stockholm syndrome).
But that in fact and obviously isn't an excuse or escape from the crime they both have committed.
I understand why people feel sympathy, sangwoo lived in an abusive household and got raped by his own mom, yoonbum lived in poverty with an abusive uncle who molested and raped him. But I legit do not get how anyone can like either of them
mkay so- i really don't get why people sympathize and like with sangwoo and yoonbum- they both murdered innocent people- i'm pretty sure sangwoo could easiy be considered a straight up serial killer. and yoonbum has stockholm syndrome. Don't come for me, i just personally really dislike this story because of how fucked up it is, this manhwa basically romanticized; torture, murder, serial killers, kidnapping, stalking, rape, ect. ect. god forbid someone takes this manhwa the wrong way, and decides that it's a good idea to pull this shit. Anyways, ya'll are entitled to your own opinions and so am i so please don't come for me :) (but sangwoo is a fucking psychopath)