Detective Yonghye, a member of a special missing persons unit, is assigned to the disappearance of a man in his sixties who has vanished without a trace. Yonghye is known for her unusual ability to sense a distinct “smell of death” at crime scenes—an odor no one else can perceive. The smell leads her to bodies and awakens something instinctual within her. While her investigative skills appear exceptional, this ability is tied to a secret she has concealed since childhood. As Yonghye traces the missing man’s movements, an unexpected memory resurfaces.