When Eun-soo gets lost in a country road, he meets a mysterious girl and is led to her fairy tale-like house in the middle of the forest. There, Eun-soo is trapped with the girl and her siblings who never age. Soon he learns that all the adults who visited or stayed in the house have met mysterious yet terrible ends. More shockingly, their cruel deaths are drawn in detail and made into a fairy tale book by the children. Scared, Eun-soo tries to find the way out, but the house is secluded in the forest with no way out. And then, Eun-soo finally discovers a book which tells a brutal end of none other than himself!