I'm not going to lie, I enjoyed this k-drama, but I think its biggest problem is that it's very forgettable.
On one hand, the chemistry between our two main characters is good and it shows on screen. This show certainly doesn't let Song Kang's physical attributes down lol.
However, what I probably didn't like much was the plot, which in itself is not very innovative in the fantasy genre, it takes us back to past lives again, and reminded me a lot of Doom at your service and Destined With You and so many other kdramas, almost as if all of the fantasy Korean dramas had a child. For that reason, I think this show is easily forgettable.
Although I repeat, I'm not going to lie, I did enjoy it, but I wish they would have omitted so many things that I could tell were plot fillers and added very little from my perspective, and most of the characters were not that well written.