Responses
I cant thank you enough for this, and yujin's dad is straight up demon, seriously how could a person live in such a hatred??? If somehow the genre turns into fantasy and yujin's like the son of demon and angel, (that'd explain his angelic voice contrasting his mischievous personality *pardon my english) that could work

Guys, let me break this down.
So they made a contract where the uke would compose music so the top could sleep at night. As part of the deal, they agreed that having sex with other people was none of each other’s concern. No emotional involvement, no attachment.
But then the top started developing weird, unfamiliar feelings for the uke. Instead of handling them properly, he reacted badly — he started bullying the uke during intimacy, saying one thing while doing another.
The uke eventually left because he felt humiliated, and the moment he realized something was wrong with the top’s feelings, he wanted to run.
On top of that, the uke already has deep trauma, mostly because of his dad — who kept pressuring him and blaming him for something that happened when he was a child, even though it wasn’t his fault at all. The uke did nothing wrong, but he grew up constantly being reminded of this “mistake.”
Because of that, the uke kept refusing to admit that he was developing feelings for the top. The guilt, fear, and emotional pressure piled up, and he escaped instead of facing it.
What I’m still confused about is:
When exactly did the uke’s dad try to kill the top when they were children?
And honestly — am I the only one who doesn’t think the top’s personality is actually that awful? I don’t find him shitty at all. On the contrary, he feels very loving, just emotionally contradictory. He says one thing and does another, yes — but he doesn’t seem cruel. He feels emotionally inexperienced and green, not malicious.