Idk if anyone has theorized this yet but I think that the white hair seme was supposed to be endgame but the black hair purple eyed seme (when the got back in time reference chapter 25) prevented them to do so, and since the white hair was not only an outcast and the cause of bad rumors/reputation of the family; but I also suspect despite being the outcast by the family he is actually talented and on top of that Kwon being nice and happy with him--- drove the black hair to do something bad which resulted in the past life Kwon losing his life. I think current Kwon is being cursed by the Black hair to prevent him from finding the white hair & being happy. That is why the white hair who might also be cursed had to possess the body of the guy and probably was kinda possessing him in past which is why his personality switches according the NPC characters we saw earlier in the story
Idk if anyone has theorized this yet but I think that the white hair seme was supposed to be endgame but the black hair purple eyed seme (when the got back in time reference chapter 25) prevented them to do so, and since the white hair was not only an outcast and the cause of bad rumors/reputation of the family; but I also suspect despite being the outcast by the family he is actually talented and on top of that Kwon being nice and happy with him--- drove the black hair to do something bad which resulted in the past life Kwon losing his life. I think current Kwon is being cursed by the Black hair to prevent him from finding the white hair & being happy. That is why the white hair who might also be cursed had to possess the body of the guy and probably was kinda possessing him in past which is why his personality switches according the NPC characters we saw earlier in the story