Responses
dude did you even notice how he look at her from the very start? it's not how you look at a sister XD and they didn't grow up together so I don't see what the problem with Yus being the ML. he is cool, handsome, very caring for her has his lover to be and not has a sister.
and the noble's society never seen them has bro-sis anyway but has enemies since they not related by blood. I really don't see what your problem is with this story.
Is Yus the ml? I really hope not I don’t really like those type of incest but not incest stories it would suit them better or be siblings