Who's to say it wasn't the same for the dad you're so quick to write off? It really doesn't matter. I know webtoons and anime like to make abusive childhoods a sympathetic shield for abusive, controlling, manipulative adults in order to make their crimes against others seem lesser or not that bad somehow but it's bullshit. (And dangerous perpetuation of a patriarchal myth but I don't want to get that serious.) This is a toxic, romanticised abuse story from top to bottom, and the harm done to Yejun will never be fully acknowledged or addressed in the story in order to make the romance work.
So, since I am aware of my trash reading tastes...the dad. :p
Okay so where's the story about the dad 'cause he's kinda...