Hyun-su and Soo-jin are newlyweds. Seemingly out of nowhere, he starts talking in his sleep. "Someone's inside." From that night on, whenever he falls asleep, he transforms into someone else with no recollection of what happened the night before. Soo-jin is overwhelmed with anxiety that he'd hurt her family while she sleeps and can barely sleep a wink because of this irrational fear. Despite sleep treatment, Hyun-su’s sleepwalking only intensifies, and she begins to feel that her unborn child may be in danger…
정유미
as Soo-jin
이선균
as Hyun-su
김국희
as Min-jung
이경진
as Soo-jin's Mother
윤경호
as Doctor
김금순
as Shaman
Kim Jun
as Jin-hyeok
Lee Dong-chan
as Park Chun-gi
박현정
as Nurse
Oh Yun-su
as Drama Actress
Hong Ha-na-im
as Receptionist
김남우
as Soo-jin's Co-worker
