Responses
I think that he knows that something happend but not exactly what.
I'm just assuming here but I feel dojin is the kne who brought byul to hyesung's egg donor. So I think in byul's pov, that's just his grandmother but on the other hand dojin? he is a fucking traitor
what byul has been doing is actually betrayal if he knows what happened to hyesung (forgot if he knows or not lol correct me if I'm wrong)