One of my theories for this is that he might have been raped or sa'd while in the gym after losing a game. He got ptsd from it and started doing it to other people to empower himself and feel less weak and ashamed. After all, he always needed sex before games to boost him up and empower himself, degrading the others.
Jumin might have SA'd him or his father did.
Jumin might have done it repeatedly whenever Jaekyung lost to him which might have gotten the 'jinx' name. Or maybe he was groomed by his father one night after he came back from gambling
Hold up that actually makes sense!! He could have ptsd of being raped and it caused him to feel weak and ashamed and with men being raped it's very different from women. the way he wants to get back and avenge himself by having sex before a match to feel empowered enough to win and remind himself that he's not weak like he used to be and that is his own way of dealing with his trauma which isn't acceptable ofc but it makes you understand his mindset and why he's the why he is now (aggressive, extremely protective of himself, doesn't wanna show weakness, hates affection)


what if that's his brother...
Bruh…no f****** way I was also thinking something like that….
Ooooh yeah from his mother's new family. That would be wild.