PROS:
- A refreshing genre and plot (this drama was released in the season of thriller/crime dramas).
- Chic, gothic, savage, cool af lead female. I dare to say this is the real Del Luna's Jang Man Wol competitor. IOTNBO's Go Moon Young is crazy, but from the character consistency side, Sell Your Haunted House's Hong Ji Ah is far on the top of hers.
- Touching ending. I'm a male and I couldn't hold my tears watching how Hong Ji Ah's story ends.
- Horror-themed drama is not that common, but this drama bravely shows a beautiful story while maintaining its scary scenes. - The concept is unique (just like Hotel Del Luna's uniqueness, but the story is far different).
- Mesmerizing action scenes by female lead that we can rarely see in K-Drama.

Cons:
- Lack of comedy.
- The anti-climax is not that dramatic and too short.

Questionable Pros or Cons:
- Horror level: It's on the same level as Hotel Del Luna. Jumpscares are there, but only a little amount and intensity.
Not so horror. If you don't like scary stuff, this is one is for you. But if you a horror-drama lover you might find this drama not so satisfying.
- No romance: I personally love it when romance is not taking a big part in the drama. It focuses only on the mystery and horror plot. But, I think most people want to see the male and female lead end up in a romance world.