This is by far the best Korean Horror drama ever.
So this season we got myriad of Korean horror dramas. It's like all the Director's and writer's got together and thought let's just bring the horror genre to Korea and simultaneously many networks released some good horror dramas (still are : The Priest) Many were hits and few were misses but compared to the previous record that Korean held with Korean horror DRAMAS (not movies) this year was actually good.
SO in order to stand out from this long list of horror dramas one had to do well. The guest? doe waaaaay more than good. From the first episode itself it manages to grasp us and not let go. The plot line is nowhere cliche and the characters are very well fleshed out. One thing I liked was that they kept us guessing till the last episode. Personally I feel the last episode was somewhat lacking compared to the rest of the series but it does not make anything less boring. The plot was always moving fast and the story was engaging at its best. One thing I loved is the fact that they managed to give a story with consistent characters. Yes sometimes the female detective was annoying as hell but other than that the friendship and bromance they managed to build in this was wonderful.
Another thing I absolutely loved was the message the director wanted to give us. If you see the ending credits the director clearly states it. It was for the people to know the ugly truth of fellow people. It was not the demons that made those people do what they did but it was their evil nature that they were harboring inside which led the demons take control. The suppressed emotions deep inside. So it is not the demons we should be afraid of but rather the people. Who have the ability to bring such evilness out to this world.

PS- I would recommend this drama to anyone easily why? Because one of my non kdrama fan (actually she really doesn't like them) saw me watching this and thought it was interesting and sat down and watched it with me. She went crazy. She scolded me for watching this without her also. She was that engrossed in this!!! So freely recommend this guys!
Also once you are done go check the BTS of this drama to see the cute chemistry between Kim Jae Wook and Kim Dong Wook and how cutely Kim Jae Wook is around Jung Eun Chae. Actually all three have amazing chemistry going on (I meant in the sense of friendship) their sets are always having fun.