That was kinda boring. We are barely given information about the mystery, it's mostly a slice of life with loads of repeated scenes. The actually story is no bigger than a 2-3 hours movie. Almost nothing happens in the first 5 episodes, the story starts at episode 6 with tiny bits of small teasers every now and then. Most of the "previous life" story is condensed in episode 15 and half 16. At least it was nice visually.

On another note, I prefer to see Yoo Ah In in movies rather than long format dramas. He was also the main and the only highlight of this drama.