Yuk Chaewon is the girlfriend of Jeon Wonwoo. They've been dating for two years, and they seem to be going strong, and becoming stronger. But then, Jeon Wonwoo's BEST friend Kim Mingyu, finally moves back. Yuk Chaewon and Kim Mingyu are introduced to each other and seem to be quite fond of each other. What will happen when Yuk Chaewon and Kim Mingyu finally figure out they're feelings for one another? What about Chaewon's boyfriend, and Mingyu's bestfriend Wonwoo? "All's fair, in love and war."