Yunho is the Kingka of Harusho Gakuen while Jaejoong is a shy student. Never in everyone thought that these two was actually childhood friend because of the different personality. Well, even if they are a childhood friend,it doesn't mean that they are BFF. They most likely be an enemy... And about Hyuna, Yunho little twin sister, Jaejoong best friend came into their lives and will Jaejoong know what is Hyuna deadly secret?