Why would Evil Sister kidnap Dohye not Nayeon?

I think the reason Evil Sister kidnapped Dohye instead of Nayeon is, Dohye is a bigger threat to her end game. I don't doubt Nayeon's feelings for Noah. However, Nayeon's feelings are based on lust. Dohye's feelings are based on love. Over time lust fades and loves grows. I hope Noah forgives Dohye. I hope Dohye's love gives Noah strength to save himself. If Noah saves himself instead of being rescued, I think it will aid in his emotional recovery. It will help him regain his pride and give him strength to protect himself in the future. While I want Noah to have others who support him through this. In the end, I think it will be more satisfying to have Noah himself be the one who wins against all the evil, cruel, manipulative, disgusting, hateful, ugly, rapists.