Hong yongsun (born on 1996) is a girl who really loves music. she has a dream to become a producer. she wants to make music. her brother, Hong Jisoo (born on 1995) , is a member of a boyband named seventeen. Jisoo or usually called as joshua, always supports his sister's dream. meanwhile in seventeen, Lee Jihoon (born on 1996) or who is called as woozi , is the one who produces their songs. how if Jisoo introduces yongsun to woozi? will yongsun be happy? since she can learn a lot