Seo Hyeji and her best friend, Park Sooyoung, always stayed together. There wasn't a time where they never hung out, or did something crazy together. As Sooyoung's mother remarries, her new step brother is the cause of their relationship falling down hill. Kim Taehyung, the bratty new brother of Sooyoung, is constantly in Hyeji's hair for no reason. Soon after, Sooyoung begins to date the high school pretty boy. Jeon Jungkook, known as the school's noona killer, is an arrogant, rude, stuck up snob that only cares for himself. Because he is another reason for the problems in their friendship, Hyeji begins to dislike him as well. With Taehyung always in her space, she has to figure out a way to secretly push Sooyoung away from Jungkook. As Taehyung gets closer to Hyeji, a sudden feeling hits him. But as Jungkook and Hyeji grow close, she gets caught in something she never saw coming.