Maybe he's recesive and became omega after too much exposure to alpha's hormone? Can't wait for the next chapter(▰˘◡˘▰)
He's a dominant Alpha. Besides, in early chapters of LIAI, Dojin is also thin.
I mean, dojin just said that he became bigger BECAUSE he fell in love. Byul isn't in love yet. And I hope to God that the author doesn't *magically make him a omega because he's the bottom* (just assuming the byul is the bottom). I kinda irriates me when author's twinkify their bottoms. I personally like a big boy as a bottom
(づ￣ ³￣)づ.
Byul is def. omega or rather he will be