Ino is somewhat at fault for Seolhyun split personality, but he didn’t do so out of bad intentions. Seolhyun has marked Hwa since they’re kids, so without Hwa there’s a chance Seolhyun might go crazy or even die because he need his partner to tend to his needs when he’s in heat. Because of the hypnosis, Seolhyun forgot who he is and can survive without Hwa by his side. This is what cause the split in personality. Seolhyun is a female who think of himself as a male.
Oh LOOOOL you are right im stupid !!!
I guess i just didn’t care enough to even think people would talk about them !! XD
But it’s not really confirmed either about them. The translation is a bit off so it’s possible he meant something else (first of all, they are black and he is white, so its weird they would be siblings because the skin colour is VERY different)
I’m not 100% sure but I remember it’s because Hwa is going back. He only came there to visit. Ino found out Seolhyun and Hwa are already a pair after Hwa left and that’s why hypnosis is the best solution he came up with so Seolhyun body don’t act up. If not his body will go in heat and need Hwa (his partner) to take care of. It’s said that without his pair he can die. They originally plan for Seolhyun to be a pair with a pure male lycan but Seolhyun went and marked Hwa beforehand. That’s why the problem is what it is now. It’s somewhat similar to Hwagok and Yibin story where the lycan is trying to get Hwagok to marry Ino.
The story is quite confusing and the translation are also mistranslated at time so I might not be 100% correct but this is what I think the situation is.

Wait im confused. Idea said 3. Who does that include? Did he meant the uke + his womf side + the baby. Or the uke + 2 babies. Or 3 babies?
Also i dont understand Ino. Is it his fault that the uke has split personnality or did he have the use hypnosis BECAUSE he already had 2 personnalities.
Btw for those who lost track and thinks there’s incest.... The seme isn’t related to Ino, so there’s not incest.