I really want to know more about the backstory on su’s father (blond). He went to prison right? Why and why did he leave his husband?? The previous backstory was too short.
If I'm not wrong, they get divorced or break up because the dad was abusive (? I mean there was some bruises on the daddy's (the blonde one) body) or was a toy to his (the other dad) eyes and dump him when he gets pregnant with Su (this last one is more like one of my theories from what I saw in the chapters and their interactions).
I think that he went to jail for some reason related to money (like fraud or stealing or something like that) and I agree with you.
Their set-up is like between sex partnership and cohabitation. However, that bs thinks more like a play and taken for granted. Since he does not put the label, that red lipstick stain is not a big deal for him, so he tells Su Han, MCs Dad, that it is none of his business. So, as time comes, MCs Omega Dad is too FED UP to the point he left that Asshole.
This should have a yandere tag