Choi Woo Shik and Kim Dami first project together - good thing that they decided to work together again - they really did great job here. We even have Go Minsi here.
More important here - we have action, suspense, mystery, supernatural and great plot twist - what more to ask?
Warning - it is a little brutal.
If you love this then check second movie The witch part 2 the other one and the drama The tyrant.