So if I'm correct, ino means that Seolhyun is female but because he just his marking (not sure how) there was an imbalance in his body, so due to that, Ino had to hypnotize him into thinking he was female. There are 3 kids, 2 formed by the wolf, the twins and one formed by Seolhyun, but Bev's if the body's imbalances, it's difficult to keep them alive