Isn't he a purebred male lycan? That's why the elder got mad about Hwa hanging around him. I think he only lied about being a female lycan.
There I changed it
Seol (the uke) did not lie about being the female lycan, HE IS a pure-blooded female lycan. The issue is that he is aware of or he forgot he's one.
He thinks that Hwa Lee (seme) reacted to his adopted brother's pheromones.
And there is a solid reason that he had to reject our same. Because he thinks he's a purebred male lycan, he thinks he that he should be with a female lycan to keep the blood pure, this is what the elders want. He was basically brainwashed to believe that bs since young.
A couple of corrections of my former comment
Seol (uke) IS NOT aware that he's a purebred female lycan.
And I meant seme* and not same.
I apologize for the confusion.
If you like him and you even lied about being a female Lycan so that he can fuck you, why reject his proposal of being boyfriends? Sorry my brain cells can't digest this information