Following the mysterious outbreak of “monsterization,” the survivors of Green Home have scattered in search of new refuges. Cha Hyun-su, a special infected who exists on the border between human and monster, decides to use himself in the development of a vaccine.
Meanwhile, Seo Yi-kyeong struggles to find her missing husband while facing childbirth in extreme conditions—prompting deep reflections on humanity and motherhood. Hyun-su witnesses humans burning monsters that showed no signs of aggression, fueling his internal conflict over ethics and identity.
In a world where the line between monsters and humans grows ever more blurred, survivors fight in their own ways to protect their lives—and what it means to remain human.