Just based on the Director`s interview.
In Korea, there is an old superstition that every each area have a ghost who protects the people of the village. They call it "Tochack-ryung" means ghost who stick in the land. So the woman here is a kind of good ghost who is fated to protect the village. She wanted to protect her village from that evil spirit. This is why she was wearing victim`s stuff like cloths, hairpin.
The shaman is connected…