beta
The social circle of architects. Wooju's parents and prof's dad all knew each other. Then it seems there is rivalry between Prof and Jiheon because they already knew each other, casually talking and Jiheon hiring Prof, then the snide remarks on Jiheon's mother. Being half brothers with their mothers at each other's throats and Wooju's kidnapping was simply him being mistaken as Jiheon, but Wooju now used by Prof to take revenge on Jiheon - are all plausible.
So....Wooju being a dominant/recessive omega to explain why men are flocking to him is now a dropped theory? I don't think it fits anymore since they are architects, not doctors... would there be no explanation why Wooju attracts alphas? He's really just an attractive beta? Awwww...I like the omega theory though.
On whether Prof did it, idk. Maybe, hopefully the author addresses it when Wooju takes a shower. I would want to be certain whether it happened or not.