Responses
I believe it's cause Byul is a dominant alpha too so he needs someone with equal pheromones powers and above to be able to stand against his own pheromones.
Dominant Alpha being the top of the top, so a stronger dominant alpha is needed.
It's a way of foreshadowing their future relationship dynamics since the one with stronger pheromones "tops"

So in chapter 21 byul mentions how siwoo was only able to break up the fight bc he’s a dominant alpha. So byul is a regular alpha and siwoo is dominant? I feel like that should’ve been talked about a little more