When Moon in the Day started, it had potential to be really interesting. The whole past life connected to the present life could have been done well but the let down was the story itself.

The major problems I had with the plot was that they really kept dragging what actually happened in the past. Everything was mysterious but not in a good way. Rather in a very slow and boring way. The reveal will only come in the last 3 episodes and you feel like, "is that it?". Also one thing I noticed is the FL in the past had struck the ML on the neck. But in the present, his scar is on his upper chest/shoulder. A very bizarre mistake when you keep repeating that scene and highlighting where the sword struck him. It simply does not match. They just wanted to be able to hide the scar without making the actor wear a turtle neck.

Another thing I disliked is the FL was a strong character. Both physically and mentally. She was capable of taking care of herself but shortly afterwards, she ends up being made to portray a helpless character. I wish they would have kept her character as a firefighter. She shouldn't have had to give up her job. Rather if the writers allowed us opportunity to see how much the ML actually cares for her even when he thinks he doesn't when he sees her endangering her life to save others. For the first half of the show, ML was trying to kill her and that suddenly changes without explaining how or why his anger subsided or why he thought he could move on if he was the one to kill her to begin with when he didn't do that in any of the previous lives. It also begs the question that if he was with her for 1500 years, how was he unable to protect her other times she dies but this time/life it was possible like saving her from drowning to the point that she believed she had a guardian angel.

There really isn't much happening in the first half. The historical scenes were good. They should have shown more moments in the present. This also needed more romance. The ML and FL were serious for the most part. Wish we could have seen their chemistry throughout even if was funny moments.

The brother's character was decent. The bad guy was okay. The other characters were mostly just there without much effect. The monk also spoke in unnecessary riddles so it was mostly a waste.

The ending is okay but I didn't really feel super delighted. Wish they had shown more. I guess you can call it a realistic ending. It's not a terrible show but nothing fantastic.

I thought the theme song and the design of it was beautiful. One of the few things that really stood out.