Yes, I don’t particularly like the dude he didn’t care about su mu’s mom (don’t mind me calling him mom) and it looked like he was just their for the sex. In a relationship you need to have time for each other which the other dude didn’t. Tbh if it was me I would also treat that guy the same way, you protect my grandson and I give you nth in return. Why? Because you did the same thing back then
Yeah, he looks like the classic asshole dad that wants a redemption arc or get back, which I know that it'll happen soon or later, with Su Mu's mom (I think that we can call him mom because he basically gave birth to him) because he understand his mistakes (that ARE still serious) and wants a perfect family like that jerk of Ning Ye.
I mean don't get me wrong, I want to see the 3P couple (I hope that is a 3P relationship and don't another love triangle) but we don't know almost anything about Su Mu's fathers.
I think they get divorced or break up because the dad was abusive (? I mean there was some bruises on the daddy's (Su Han {the blonde one}) body and was almost forced to have sex with him when he was hurted from the other times that they did it) and was scared that Su Mu would be in danger or something like that or he was like a sex toy to his (Shen Linxiao {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'm thinking about the possibility that he did it to support Su Mu.