In a world overrun by zombies, Taesoo loses his wife and flees deep into the mountains with only one resolve left: to protect his newborn daughter, Nabi. For ten years, the two live completely cut off from the outside world in a small cabin, with the mountains as their entire universe. One day, a stranger from outside wanders into the mountains and appears before them, shattering their isolated peace. The time in the mountains is over; now Taesoo and Nabi must step out toward the dangerous outside world. It is a post-apocalyptic father–daughter story about survival, love, and facing a ruined world after a decade of hiding.