From my understanding there's a spoiler going around that would explain the dislike for blonde dude, though I'm not sure how that erases black hair dude from his trash status.
Also even without spoilers, while blonde dude is seemingly caring and protective, he's still very sex-obsessed and doesn't seem very romantic; the only way he compliments woonie is by saying how hot she is, like there's nothing else worth noticing about her. This is definitely redeemable, not as trashy and jail-worthy as the other ML, especially considering the r*pe and abuse, but imo a truly good ending would be with her making real friends, and breaking free from these two losers
Omg I would love that, if she would ditch those two and be free
So why do people not like Blondie again because the black hair love interest is actually a horrible human being(●￣(ｴ)￣●)