Kim Hyomi(you) has finally recovered from the heart transplant with Changjo after 6 months and has finally debuted as a Soloist under Starship Entertainment. But now that her heart isn't her own, she has to be careful about how much stress she puts on it. And being a singer, there are bound to be lots of stressful moments and not mention sharing a dorm with a cold hearted GUY. But what's this story without the 4 guys who helped her get through it all? Youngmin