I have the absolute same theory
But like reverse, like the beta probably had some left over pheromones from his father on him
it makes sense cause we knew from the sttart that he had a child bit they mever showed the child to the readers just so we can get a plot twist. ,(￣∇￣")
O is a single dad who cant's provide emotional support for his child. You can't blame the child for resenting his absent yet one-and-only parental figure. The B is a child because his single dad failed to respond adequately to his emotional needs. If the O dad really feels bad for his son, he would never go back to his son's ex-boyfriend plus cheating partner. They can try the co-parenting thing. Image the sister grow up and find out all her cheating parents, brother never want to come home due to being cheated on.
I just finished the book and feel like I have to say something lol This is definitely not a wholesome story but it’s also not a story about a bunch of irredeemable trash who don’t care about hurting others- it’s just a story about people. People who are sometimes cowards, sometimes selfish, nobody is perfect and that’s one of the things fiction does best: tell other people’s stories. I can’t say Lim Jae-hee is ever a sympathetic protagonist but he’s strangely likeable in all his imperfection (and there’s character growth). I saw there some spoilers that seem to either be wrong or at least taken out of context: SPOILERS BELOW
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If looking for “cheater revenge” you’re not going to be satisfied, but A tries to break up with B but is a coward held back by guilt, A and O break up after realizing who O is, B gets a new BF and breaks up with A ,and A+O don’t get back together until SPOILER (pregnancy) when there’s a bunch of drama and A comes clean to B. B beats the shit out of him multiple times but B doesn’t want his mother and sibling to suffer so eventually excepts it and everyone lives dysfunctionally ever after (he went to study abroad a year later but Jae-hee literally “checks up on him often because he wants to be a good step-dad to his ex boyfriend”). Though I think the ending is a little unrealistic, they also didn’t gloss over or just excuse the behavior- there was a lot of character growth and angst in between.