After the fall of the world, two brothers struggle to survive amidst dwindling resources and constant threats. Their lives dramatically turn when they encounter a mysterious woman, known only as a "Lost One.” Driven by desperation and curiosity, they capture her, hoping she holds the answers to humanity's downfall—or a chance for its redemption. But as days turn into weeks, one brother finds himself drawn to her in ways he never expected. Consumed by his forbidden love, the brother risks everything forcing them to confront a haunting question: is she their salvation, or their greatest danger?