A ghost-story whodunit? Starts as a bungling mystery/comedy (in the veins of Memories of Murder, with the Korean trademark of copious splattered blood), then becomes creepy with a possibility of ghosts and demons, then ends in full-fledged, hardcore horror. The miracle is, it achieves these results with not even a single screaming shock-shot or horror gimmick. Yes, there are some police procedural plausibility issues (and an unnecessary zombie sequence), but as soon as you're on for the ride, you're on till the final astounding mystery-resolving moment. A must for "true horror" lovers (not the Babadook/Conjuring/Annabelle/... screaming-in-your-face kind).