浦江郑宅有一大家族名为郑氏义门，他们以孝义传家、以清廉立世 ，世称江南第一家，是中国古代家族文化的重要遗址。在白麟溪边上，有一家郑宅特色麦饼小店，坚持以民以食为天为原则：粮食是生命之源、是力量之源，是人民生活的平安保障。本片以江南第一家的故事为背景，也探索这里的传统特色美食——麦饼。

There is a big family in Pujiang, China. Zhengzhai named Zheng Yimen. They pass on filial piety and righteousness to the family and establish the world with integrity. They are known as the first family in the south of the Yangtze River. They are an important site of ancient Chinese family culture. On the edge of BaXiLin River, there is a small wheat shop featuring Zhengzhai, which adheres to the principle that food is the first thing for the people: food is the source of life, the source of strength, and the guarantee of people's life safety. The film is based on the story of the first family in the south of the Yangtze River, and also explores the traditional specialty food here ‘Mai Bing.’