A dispute over mushroom cultivation erupts in Qinglan Village. Luo Musheng insists on a forest-grown lingzhi project that takes three years to yield returns, keeping detailed accounts for each household and relying on inspections and contracts to ensure quality. But buyer Jin Dahai tempts eighteen households into switching to morel mushrooms with promises of profits in three months and an initial purchase price of 30 yuan per jin. As market prices plummet, Jin Dahai repeatedly cuts prices, secretly deducts fees, mixes in produce from other villages, and falsifies labels, leaving farmers with devastating losses. Meanwhile, the lingzhi cooperative passes pharmaceutical company inspections thanks to meticulous records and repeated quality testing. Jin Dahai is eventually investigated and punished for falsely claiming the origin of his products and forging traceability codes. Three years later, the Qinglan Village cooperative has expanded to 300 mu and become a reliable supplier to pharmaceutical companies.