Zheng Laoshi, the third-generation inheritor of the century-old Lao Zheng family's roujiamo, faced family decline and came to the alley entrance to set up a stall with his aged sourdough starter and old broth. Facing Qian Daqiang's malicious preemption of the signboard, low-priced marketing, and inferior ingredients to steal customers, he always insisted on fresh meat, pure oil, and ancestral processes, accumulating public praise with the support of Dou Hua and others. Qian Daqiang continuously spread rumors to suppress him and expand his franchise, ultimately being exposed for food safety issues and bearing responsibility. Zheng Laoshi won recognition at the food culture festival, restoring the Lao Zheng family signboard to its orthodoxy, opening seven branch stores, and still personally guarding the first pot of dough and broth, keeping the artisan's conscience.