"he's nothing but a scum who uses his bad past so he could get way with anything"
lol are we reading the same story? Cause yeonwu doesn't know anything about his trauma and taehwan is not forcing himself to yeonwu thinking that he would accept him just because his "bad past" makes everything okay. Taewhan knows about his mistakes and that's the reason why he changed. He has never used his trauma so he can get everything he wants.