My guess abt relationship dynamics

My guess is since we saw little creepy yooyoung lurking while kwon and yooyeon were talking is he got jealous and wanted kwon for himself, maybe because he hates his brother and feels an 'outsider' shouldnt have anything for himself

Maybe along the way he somehow manipulated things to make sure kwon didn't go back to yooyeon like threatening to hurt his brother, especially cause it seems like his family found him a burden. no one would punish an heir for hurting a 'cursed' son, and not many people knew he existed anyways. So i guess Kwon, wanting to protect yooyeon, tried to distance himself from him by maybe saying he hates him and to stay away because he loves yooyeong instead? And maybe that's why current yooyeon seems like he's still hiding something from Kwon, in his memory Kwon didn't like him anymore.

But tbh that doesn't make total sense cause in one of the first dreams kwon felt like the dream he had of his past self and yooyeong was two people in love. But the next dream after that all he felt was fear and disgust, and that yooyeong was selfish and wanted to hurt him. So was the first dream him actually imagining yooyeon but with his current appearance (sort of?) Or was there actually a point where he loved the past yooyeong BEFORE he showed his true colors?

Maybe yooyeong didn't threaten him at all and just acted charming and secretly had yooyeon sent away, so he cant interfere or be a distration to kwon. There was that scene where kwon was missing him then yooyeon really did appear and hugged him, which implies he didnt have negative feelings towards him. So maybe yooyeon assumed kwon was actually still in love with yooyeong and doesn't know how their relationship became toxic? BUT then why did he know yooyeong was terrible when he said he shouldn't feel bad for him dying and he doesn't deserve sympathy? And why does he seem to think kwon would hate him if he had his full memory back ?

That's all I got can someone who read the novel tell me Iif I'm right? I don't mind spoilers if I'm wrong

MY LAST THEORY WHICH IS MOSTLY CRACK what if yooyeon wanted to take back what he felt was his, like his position as heir and the person he loves so he came back to wage war? And maybe because kwon was a body guard of the estate/yooyeongs partner, he was killed with him, and yooyeon was too late to stop it? So maybe he thinks if kwon remembers he'll resent him for causing his death? Ok now I'm done