After that, he took another turn and filmed Public Security Bureau and Soldiers with urban themes. The latest documentary is "Listening to Mr. Fan's Past" completed last year, which is a simple personal oral history; Jianning Kang said that this is his most satisfying documentary after The Teacher of Yin and Yang. Kang Jianning's most mature work is Yin Yang Shi, a village in northwest Ningxia, called Doupo Village. The real loess slope is seriously short of water, and the relationship between man and nature is very tense. The protagonist of the film is a Feng Shui gentleman named Xu, also known as the master of Yin and Yang. Kang Jianning first noticed him because he still had a pen in his pocket. He is an intellectual here, and many people in Fiona Fang will ask him to count the days and set his position if he has something important. He also has a whole set of life philosophy of educating his children and others, including loyalty and filial piety and "five stresses and four beauties". There must be rules in everything, and don't worry about political matters. As long as farmers plant the land well, everything will be fine at home ... but these principles have become flexible. The main plot of this film revolves around water. The government subsidized them to dig holes to store water, but farmers took the opportunity to make more money. The newly-built ditch road passed through Yin and Yang's house, and he got into a fight with the village chief. He dug a well in a place with good feng shui, but there was no water. He refused to give up because of the problem of face. He and his sons tried to drill a second well. This time, there was little water and there was a landslide. After some discussion, they quietly gave up the well they had just drilled. In life here, "hope" is as rare and precious as the water here. At the end of the film, Mr. Yin Yang, wearing a new suit, is the matchmaker. He said that although it is not so good here, it will be good to survive these years!