Kim HyoMi (You) has finally come back to Seoul after 4 years of studying abroad in America. So many things has changed. Your brother, Kim MyungSoo, has become part of idol group sensation Infinite. Your bestfriends Choi JongHyun(ChangJo) has also debuted in an idol group known as Teen Top, Lee ChangWoo is a trainee in Woolim, Jo YoungMin and Jo KwangMin have also debuted as Boyfriend. 4 years, 4 bestfriends, 1 past love, 1 unpredictable future.