The world is plunged into a heatwave apocalypse. In her previous life, Su Wanxing had her supplies drained by her husband's family and eventually died of thirst. Reborn on the very day the catastrophe begins, she awakens a bullet-comment system. By fighting back against villains and protecting her family, she can obtain supplies such as clean water and ice. This time, she decisively fights back against her in-laws when they come to plunder her home, exposing their schemes involving stolen safe-zone admission slots, poisoning, and collusion with bandits. Relying on the system's supplies and her own intelligence, she protects her parents and leads her community through the crisis, eventually becoming a community officer. She also finally reunites with her childhood sweetheart, Lin Zhou, whom she had believed was killed in action.