The first one kinda makes sense but the second one doesn't. They're not friends, like acquaintances at best. And he was only an butthole considering how they broke up and what happened after although we did get an explanation for that. Everyone eventually gets their special someone, so it makes since for his special someone to be someone who'd help him break down his walls
in the second one I meant the white haired guy knows abt how Jin-tae was an asshole to ha min in the past and since the white hair guy is childhood friends with sung Han he should be a good friend and not pursue his friends boyfriend's trash ex.
Im so gagged seeing people want more of the side couple I absolutely hate them and skip their scenes, if my ex was a complete ass hole to me I would feel so betrayed by my partners friend dating them and other perspective that If my friend was dating my partners abusive ex I would also feel disgusted, I just hate the dynamic should have stayed as a "love triangle"