The Mimic

Five years following the disappearance of her son, mentally unstable Hee Yun is still adamant about finding him. However, the family moves from Seoul to her mother-in-law’s hometown to help ease the mother-in-law’s dementia. Soon after arriving, strange events start taking place when they discover a corpse in a cave near their home and find a lost, abused girl in the woods and take her in.
(Source: MDL)