Extreme heat suddenly strikes the entire city. Lu Xun, a seafood stall owner in Xianyu Alley, anticipates the danger and spends all their wedding savings on generators and aviation-grade insulation, creating a rift between him and his girlfriend, Jiang Nianqing. After widespread power outages hit, rival vendors deliberately undermine him while outside merchants drive prices sky-high. Lu Xun sticks to his principles of honest business, overcomes the crises with thorough preparation, wins back his love, and leads his neighbors through the difficult times together.