Lin Yan knows full well how important the village's old locust tree and drainage ditch are to the stability of the hillside, and he insists on protecting this natural line of defense. At first, the villagers do not understand his good intentions. Later, when an unexpected crisis strikes, everyone finally realizes that Lin Yan's persistence is meant to keep the entire village safe. Under his professional guidance, the villagers work together to restore the ecosystem, rebuild the protective forest, and clear the drainage channels, transforming their village into a model of safety and harmony. Ultimately, Qingshi Village sets out on a path of respecting nature and pursuing scientific development, and its residents gain genuine peace and hope.