Theory of what is going on between guys. So dark haired guy always liked her back but rejected her ( reason unknown). In White haired guy's dream we saw girl, who can be his sister or someone he loved before. That girl chased after black haired guy, maybe even stalked and saw that he was always with female lead. Guy rejected her and maybe she killed herself or died somehow. The white haired guy wants revenge and because of that he is using female lead. This is all my thoughts. Also I kind of feel that female lead's fiance may have feeling for her also but doesn't realise it yet. Idk let's see what is going to happen.
