Usually don't watch K-dramas but this out of the several that I've watched, was really good.

Story: plot was a bit confusing but the more you watch it, the more you would understand it but overall it had a great storyline
Acting/Cast: everyone's acting was really good and natural
Music: I don't remember it having music as like the intro/outro but the songs that the female lead was singing in the show was good
Rewatch Value: definitely will rewatch it sometime in the future when I can't find any other dramas to watch