So

I’m guessing the little brother was in on the mixing genders up. That’s why he’s kind of “frivolous”, at least that’s what I got from Seolhyun and his brother’s interaction before because he knows he isn’t a female. Seolhyun was worried for his brother cuz he was a “female lycan”. But in truth he wasn’t and it was actually Seolhyun. Them living together works too because their scents get mixed up. I actually thought Hwa was smelling the brother’s scent and not Seolhyun’s at first. But because Hwa is marked (or the other way around) so he can actually smell Seolhyun and not get his scent mixed with others. Now everything is clearer.

Also that lil bitch looks like he has a brother complex