Good setting but the execution at the beginning could be better as it takes a significant amount of time to gain traction, and a few action scenes here and there really didn't look too fine at all honestly. However once the tension takes off in the second half, the storytelling does have a lot to offer especially in the plot twist department, the concept behind it somehow becomes exceptionally huge. It's just that maybe the poor writing took away some of its quality, or else this could very well be one of the most artistic Korean cult horror movie ever.