Sleep

Hyun-su and Soo-jin, a couple who recently got married, suddenly find themselves facing an unusual problem. Out of the blue, Hyun-su starts uttering strange words in his sleep, saying, "Someone's inside." This puzzling phenomenon takes a toll on their lives as it continues to occur every time he falls asleep. Each time he awakens, he has no memory of the events that transpired during the night.

Soo-jin, filled with overwhelming anxiety, can't help but worry that Hyun-su might unintentionally harm her family while he sleepwalks. This irrational fear consumes her, making it nearly impossible for her to find a peaceful sleep. Desperate to find a solution, they seek professional help and engage in various sleep treatments. However, these attempts only worsen the situation, intensifying Hyun-su's sleepwalking episodes.

As the fear grows, Soo-jin's concern extends to their unborn child. She fears for the safety of their baby, uncertain about the possible consequences of Hyun-su's sleepwalking escapades. The couple finds themselves trapped in a state of constant fear and uncertainty, desperately searching for answers and solutions to protect their family and their future.