Zhalia is Nina Fortner.
Because Johan escaped from the hospital, Nina is worried that he may try to use her to shoot him in the head. As a result, she moves to a new town, changes her look and name, so that Johan won't come looking for her. What else is that the thing about her revealing to be The Mole for The Organization happens to be the result of the hypnosis that Dr. Gillen used on her taking effect. However, when she stopped attacking Dante, the hypnosis on her breaks off.Sophie and Zhalia are bisexual.
Even though the two have feelings for Lok and Dante, it doesn't mean they're entirely straight. Sophie and Zhalia are most likely bi and have feelings for each other as well but have to keep their feelings a secret due to their difference in age.