Sleep (2023)

Soo-jin, a pregnant woman, lives with her husband Hyeon-soo, who works as an actor. Hyeon-soo starts to exhibit concerning behavior while asleep, such as saying "someone's inside", scratching his face until bloody, and eating raw meat from the refrigerator. The couple sees a doctor, who diagnoses Hyeon-soo's sleep disorder, puts him on medication, and recommends remedying actions (such as abstaining from alcohol). All the while, Soo-jin's religious mother believes that something supernatural is afoot, and recommends seeking divine aid. One night, Hyeon-soo—while asleep—puts his and Soo-jin's Pomeranian in the freezer, killing it. Soo-jin discovers this, horrified.

Sometime later, Soo-jin gives birth, and becomes deeply concerned that Hyeon-soo will kill the baby in his sleep. Soo-jin becomes more convinced that her husband's condition is supernatural in nature, and consults a shaman named Madame Haegoong, who asserts that Hyeon-soo is possessed by a ghost. Soo-jin comes to believe that this "ghost" is Park Chun-gi, the recently-deceased father of her downstairs neighbor Min-jeong. Soo-jin spirals further into paranoia and concern.

One night, after Hyeon-soo returns home, Soo-jin confronts him and asserts that he is possessed by the ghost of Park Chun-gi, explaining this theory with various reasons and evidences. Soo-jin also reveals that she has kidnapped Min-jeong, and she threatens to kill Min-jeong with a power drill if the ghost of Park Chun-gi does not exit Hyeon-soo's body and progress into the afterlife. Hyeon-soo/Park acquiesces to Soo-jin's wishes, and Soo-jin and Hyeon-soo lie down on the floor together, exhausted by their ordeal. (It remains ambiguous as to whether a ghost possession was the real explanation for Hyeon-soo's behavior.)