Zhang Dapeng returns to his village with his girlfriend to renovate his old family home, only to find that his neighbor, Liu Jinbiao, has built a duck shed right against their courtyard wall, blocking the drainage and access road with waste. Rather than argue, Zhang Dapeng quietly plants tall-growing Qi mugwort and sweet flag to naturally repel the ducks. He then installs surveillance cameras, collects water samples, and files a legal complaint. A joint enforcement investigation confirms the illegal construction and pollution. Liu Jinbiao is detained, and the duck shed is demolished. Zhang Dapeng then joins forces with the villagers to establish a mugwort cooperative and leads them toward prosperity through ecological farming.