Have to say that the first half was definitely interesting, which was why I kept on watching the drama. But then for the last 4-5 eps, I started to question if I should continue watching this. Should have trusted my gut feeling when the plot started to turn uncharacteristically dark for no reason. And just when you thought that maybe things will be overturned later, you ended being disappointed and wondering why on earth you even bothered watching this.

Like seriously, the moment the villain starts getting clingy with the main pairs and wanna get the guy to kill his girl just to justify his own belief and started killing off every tom dick and harry around the main character the plot gone to the trash already. The villain becoming too overpowered to the point of ridiculous and the side characters acting stupid by not heeding the main character's warning to not confront the villain direct and ending up being killed stupidly as well. And the ending was so anti-climax that you can't help wondering if the writer themselves gave up in making the story be decent. Which was a shame, since the earlier plot was decent only to become a trainwreck at the end.

This is as bad if not worse than a lot of western b-grade horror with dumb main characters and overpowered psycho villains.

Tl:dr, as much the initial story sounded interesting, don't bother watching this. Please watch other much better dramas seriously. Like say, Ghost Seeing Detective Cheoyeong was good. It had a similar starting plot and was much written and balanced on the detective and the supernatural theme.