Sleep
How well do you really know the person sleeping next to you? For one young couple, this question becomes a twisted psychological nightmare when a husband’s increasingly bizarre nighttime behavior takes a menacing turn. Newlyweds Hyun-su and Soo-jin’s domestic bliss is disrupted when Hyun-su begins speaking in his sleep, ominously stating, “Someone’s inside.” From that night on, whenever he falls asleep, Hyun-su transforms into someone else, with no recollection of the night before.