Responses
Yugi : know from the begining, when he met her as Baan as well as Lady Yeseo (because she has the same "scent")
Curly haired blond guy : he has a thing for Baan from what I see. He doesn't seem to knows Baan is Lady Yeseo or even a woman.
But he supect Lady Yeseo to be adopted because he met her biological brother (which looks exactly like her)
So did Yugi know from the start she was a woman? What about the curly haired blond guy. Or are they all just sexually flexible??