College student Lin Chuan returns to his hometown and finds the old tea-oil grove in decay, with his grandfather Lin Shouishan guarding the ancient wooden oil press. Starting from ten comparison trees, Lin Chuan prunes branches, clears the orchard, digs trenches against rain, controls pests, and joins forces with Su He, Zhao Mingyuan, and Chen Guilan to restore the wooden press. After the initial pressing fails, he repeatedly calibrates the steaming of materials, cake wrapping, and pressurization, finally stabilizing the oil extraction. Facing the buyer Zhou Hai's price suppression and inflation, he insists on not overdrawing the trees' vigor; after the cooperative experiences divergences, he takes a small batch of finished products to the county town for display, winning recognition through authentic craftsmanship. Ultimately, Lin Chuan chooses small-batch cooperation and long-term stewardship, allowing the intangible heritage to be used, improved, and inherited in real production.