I absolutely loved this kdrama. I watched this a few years ago and fast forward to April 2020, I'm thinking of rewatching it because it was just that great. Definitely one of my favorites.
I was casually looking for a supernatural kdrama when I came across this. I wasn't too keen on watching it at first because of the unfamiliar cast but I went for it anyway for the plot. Few episodes in, I was hooked. Couldn't stop watching it, I was at the edge of my seat on each episode. I was really disappointed with the one major thing that happened near-end, but great story and acting nonetheless.