The Mimic

A woman whose son went missing a few years ago believes her son is still alive. She believes her mother-in-law with Alzheimer's might know where he went. The family moves near Mt. Jang, where the mother-in-law grew up, thinking that it might improve her health. What they didn't know is that the mountain is inhabited by Jangsanbeom, a mythical creature known to mimic people's voices and use them to lure other people. (Summary by Greener)