Focusing on the inheritance of the ancient tribute tangerine planting techniques of the Southern Song Dynasty, it tells the story of Li Hua, the keeper of the tribute tangerine garden in Kangzhou in the Southern Song Dynasty, who traveled eight hundred years to modern Deqing, Guangdong. He went from guarding a deserted old tangerine garden alone to overcoming difficulties, integrating ancient methods and modern agronomy, leading the villagers to establish a cooperative to start a business, and finally realizing the intangible cultural heritage of traditional skills, a successful career, and a double harvest of family and love.