There was a world in which girls can choose in which side mate they want. They can go in good side-getting an handsome angel for a mate. Or in evil-getting devil for a mate. Your step-sisters eventually choose angel side. As every of them lusts for Handsomeness and richness..but you didn't choose angel side. You choose evil side. In which you get three devils for a mate. Park Jimin,Kim Taehyung and Jeon Jungkook. You are their 300+ mate. In past their mates eventually dies out of weakness.