I don't think it's worth to think about how did it... considering the whole thing about fake bodies/bodies that die and comeback to life @_@ it really can be anyone's game @_@ The doctor, the blond, Mion's family... anyone of them can easily do it @_@ but for what we have... the blond was the first one to kill the glasses guy and to fake her body's death... if that was her and there was no mind control element in the play @_@