Huge fan of IU and Yeo Jin-goo. They're both powerhouses in everything they do, so I knew the show would have strong legs to stand on, regardless of the genre.

The OST and Moonlight Sonata were all gorgeous, they really pulled the scenes together and drew you into their world. I really loved the side storylines with the hotel guests and learning about their grudges and what pulls them away from release. I also thought the side characters were all really wonderful and had great chemistry, so I didn't have issues when an episode was side-character-centric. I sensed more chemistry between IU and Jin-goo while they were just friends, but I never felt like they didn't adore each other through the end. I was a sobbing mess at the end.

The visual FX was pretty meh. It's okay that it's not great - I understand visual FX is expensive- but sometimes it was worse than cheap Halloween makeup and very amateur. I got over it after a few episodes though and tried to enjoy the show/scenes for their story and character chemistry. My only real "issue" is that I really wish there was a special episode to show the epilogue. I really wanted to know more about what happened after the end episode.