Park SaeHee (You) is a rich girl who lives with her dad and her stepmother. Even if she is rich, she looks quite poor because of her stepsister who is no other than: Sandara Park who is from the popular band: 2NE1. She always feels lonely because her "family" is always abroad. One day, she meets Noh Ji Hoon and starts to date each other, the only thing she doesn't know is that " her boyfriend" dates her just for a bet, money, fame and not love... After knowing that, a tragic accident will happen: SaeHee will be in coma, while Ji Hoon hangs out happily with his bestfriend: Jung DaeHyun, they will meet something strange: five men known as "Big Bang". This groupe will ask the two friends:" What's their wish?" 
The next morning, SaeHee wakes up to find herself next to DaeHyun. After that; the both of them will notice that only DaeHyun can see her. 

But why is her body still in the hospital? Did SaeHee's soul came to DaeHyun to find some help?
What will happen if DaeHyun starts to fall in love ? How will SaeHee react when she will discover that JiHoon lives under the same roof as DaeHyun? Will she choose her first love: JiHoon or the man who took care of her, when nobody saw her: DaeHyun?