Wealthy biology professor Kang Yu-jin takes in a new housemaid, Mi-ok, whose mother, a shaman priestess, recently died in a house fire. Initially, Yu-jin and his wife, Seon-hee, welcome Mi-ok, but Seon-hee's suspicions grow when she sees a strange wooden doll the maid brought. Believing Mi-ok is trying to kill her and take her household, Seon-hee's paranoia turns to madness, causing Mi-ok's fatal fall. Afterward, Seon-hee is haunted by visions of the doll attacking her.
Suddenly in the Dark
As the wife's suspicions grow, a seemingly innocent housekeeper's presence in their home becomes increasingly unsettling, particularly when she brings a mysterious wooden doll that fuels her growing unease.