[Please Help Me! Thread!]

I'm new to this site so i'm not sure if i'm asking in the right place but I need help finding the name of a Korean Drama that i watched on netflix. It was about a boy who was a musician and his girlfriend was the keyboard player in the band and she ends up dying and he gets the chance to turn back time to the day she died but she keeps dying everytime because it's her fate and there is no way to change it. it's a really sad drama but it's cute i just can't remember what it was called.