When your best friend becomes your first love but then things take a toll on your relationship. Your first love becomes on of the most popular girl groups out there. And all you can do is watch from afar. 
Years go by and your best friend moves to America after her group's disbandment, and all the while you are still here living in and Korea promoting as one of the biggest boy bands in the world. After losing contact with your first love/best friend for years, only to find out that she is dating another K-Pop idol. What will happen to both of them once they see each other after years of not talking or seeing each other? Does he still love her? Is her current boyfriend the right one for her?