A steadfast bun vendor refuses to cut corners or adulterate his fillings. His business is stolen by unscrupulous competitors selling all-you-can-eat buns for just one yuan, eventually forcing him away from the factory gates. The dishonest vendors profit by using low-quality frozen meat, until a food safety incident leaves workers in half the factory falling ill one after another. Only then does everyone finally realize that what makes the vendor's two-yuan buns expensive has never been the ingredients, but the weight of his conscience.