This series got 8.1/10 IMDb rating, so I thought it was a good show. It turned out a disappointment from the plot to the acting. The plot is so scattered and unreasonable! The main characters are unbelievably weak and emotionally unstable. All they can do is scream, cry, and get beaten by evil spirits. Side characters come and go with no meaningful purposes. There are so many points in this series that make no sense at all.
The worst Kdrama series ever! You wouldn't want to waste your time, believe me.