iirc it was mentioned that Soongap had a bit of dislike towards his brother since he was favoured by their father.
Dont feel bad abt him, what he did to Soongap was literally incest and rape, not only that, the medicine he gave to Soongap for Soongap's lover literally killed him so like yea lets not defend this guy as if he didn't do anything .
Half agree with u here, he's obviously meant to be a really conflicted character and there's so many times where his inner thoughts and backstory so people empathise w him. I feel like the final 10 chapters just went crazy w his character. He went from obsessive (still weird) but still in an sympathetic way to completely undefendable. Ig the author had to make sure that he could be disposed off for a happy ending without too many complaints. I feel like it's a shame bc his storyline was the most interesting aspect to me.
The aspect of Soongap hating him right from the start is very true asw, I was abt halfway through reading when I suddenly tried to remember why Soongap was so uncomfortable around him in the first place and I couldn't remember anything and felt like an idiot.

Maybe I'm going to get some heat for saying this, but for me, the brother was turned into an unnecessary villain. There were already so many antagonists, why did the author have to turn him into such a despicable person T-T
I can't bring myself to hate him, his storyline was actually quite tragic imo, so in the end I feel more sorry for him than anything.
The way Soongap hated him right off the bat from their very reunion was just unnecessary added drama imo, and it was never explained why he despised him so much. Like, the brother genuinely did not do anything to him at the beginning, just wanted to spend time with him, reconnect, and make his life easier. The whole antagonism towards him felt very very forced, smh