Jung yongyun is a handsome man who can play guitar and sing very good. in his childhood, he met a little girl music lovers like himself. and after that they were good friends until the little girl go to abroad because her fathers job. he is still looking for the girl until now Park Joohyun is a sweet girl who is very adept at playing the piano and has a beautiful voice. because the  problem of  his mother  who died, she became quiet and tend to shut herself from anyone.  up in terms of music also did she surrender. she would no longer  follow the  music school  since  the tragic  incident  that makes her hard to  breathe ForewordJung Yonghwa as Jung YongyunSeo joohyun as Park JoohyunTiffany hwang as TiffanyCho kyuhyun as Park kyuhyunIU as IU or yuuWooyoung 2pm as Wooyoung