Im guessing its that male thing where because he couldn't have her for 10 years he wants her even more, like an untouched wine that grows deeper and richer with years. He thinks he should have it all because he is desired rich handsome but she never gave 0 fucks about it and it made him insane, like a "bc you dont want ME you shouldn’t want anyone else" but she does, in fact, want another man and as he said that made him grow a big inferiority complex towards Beom-jin
it's the "if i can't have you, no one else can" mindset a lot of men have
maybe he has white knight syndrome
Bruhhh I don’t even understand y he’s so obsessed with her when she always rejects him or put a wall. Like where is that even coming from other than he thinks she’s pretty