Park SunYoung (aka Luna) just broke up with her boyfriend, Kim JongHyun. As if things couldn't get any worse, she finds her fate being intertwined with her neighbor, Lee JinKi, and his look-a-like cousin, Onew. Of course, the difficulties don't just stop there, and as SunYoung deals with the silly problems of being a teenage girl, she finds that something doesn't quite add up right...