Hyoyeon, Sooyoung, and Jessica accidentally met and became friends because of Kai who all of them are Kai’s ex – girlfriends. Bomi, on the other hand, also does the same to Jimin and Jungkook even if she has a relationship to Kai. Bomi then likes Baekhyun so that she uses his best friends to make him jealous but Baekhyun doesn’t care. All of them became friends except for Bomi and Kai. Bomi then notice that Baek has feelings to Hyo so that she threatens her own bestfriend for getting Baekhyun to her. What if 3 boys accidentally does some of the 18 signs of Hyoyeon? How will the love story end???