STORY: I really liked this drama. I know many people don't really like idol/singer actors but this one is really good. The story was interesting. There was one main story, about Jang Man-Wol and her sins and etc and there were minor stories about the ghosts. This kept the drama interesting and made me want to watch more.
ACTING/CAST: The 2 had really good chemistry and the person who played the male lead (forgot his name) did a really good job playing the character and IU also did a good job playing the selfish cold character.
MUSIC: The reason why the music rating is low is because I didn't find the music so catchy or emotional. There was like one emotional song and made me want to search it up and listen to it but it wasn't so catchy.
REWATCH VALUE: The reason why I gave this section such a high rating is because I watched this drama so many times that I lost track. I don't know how to explain it but the drama makes you miss the scenes and stories.

Anyways I hope you find this helpful and I hope you enjoy the drama :)