I like both sungho and dohyun
Feelings of love or frustration ? In the beginning he wanted his revenge, torture him and almost kill him then he changed hoping Doyun will love him back after all the bad things he did to him. When Doyun rejected him, he was raping him again and now his toy is broken. Sure he’s docile now but he’s not the Doyun he wants.

And am i the only one who kinda like Sungho a bit? Ok he raped and kidnaped someone. But you’re lying if you dont see he did that out of lingering feelings of love for Dohyun, and bcs of that at some point he’s gonna want to repent and do Dohyun much better. (Unlike that particular serial killer we all know so much)
If not then i think i spent too much time on myreadingmanga lol. Dont mind me