Bro you are an emperor have highest rights and powerful leading. You have everything but you lack affection ( that's not really to work out because you are so icy) knowing that you love your family very much. Stop making excuses! You can kill hundreds of people, even your cousin that can be a threat of your leadership!!!
As far as I know, these twins have liked Seonwo since school days, but Jaehyun did something fatal in the past that made him do whatever Junwo told him to do. So the question is why Seonwo doesn't remember who Jaehyun and Junwo are... the only ones who remember are the twins. That's all, so it's not surprising that now around Seonwo, Jaehyun becomes even more obsessed with being afraid of being snatched by his older brother, Junwo.
doing creepy stuff to that sleeping person hicc!