Li Zhiwei is an ordinary office worker who has been buying fruit from a local fruit shop for three years to care for his pregnant wife. Unexpectedly, he discovers that the shop has been systematically overcharging him. The unscrupulous owner, Liang Jianhui, and his wife, Deng Meilian, work together to deceive regular customers through a series of tricks: charging different prices for the same fruit, using rigged scales to shortchange customers, forcing them to buy more than they ordered, deliberately disrupting competitors' supply chains, and filing malicious complaints against rival businesses. But Li Zhiwei has quietly been gathering evidence to defend his rights. He reports the shop through legal channels, leading to an official investigation and penalties. He also supports the honest mother-and-son fruit shop across the street, helping establish a trustworthy fruit store with clearly marked prices.