Northwestern Henan and other remote areas.

There is an ancient well from the Zhengde Dynasty in Tongfu Inn, from which we can conclude that the story took place after the Zhengde Dynasty. The emperors after Zhengde were as follows: Jiajing, Longqing, Wanli, Taichang, Tianqi, Chongzhen.

When Tong Xiangyu was quarreling with the shopkeeper Sai of Yihonglou, Tong Xiangyu said that he wished Tongfu Inn 928 days since its opening, and wished the emperor seven years and eight months after he ascended the throne.

Among the above emperors, only Jiajing, Wanli and Chongzhen reigned for more than seven years. Considering that the well mentioned above is an ancient well, it is too close to the Zhengde Dynasty in the seventh year of Jiajing, so it is obviously impossible. The only ones left are Wanli or Chongzhen.

When Dazui and Lu Xiucai were having a quarrel over culture, Lao Bai gave him a book "The Illustration of All Nations". This book was presented to the emperor by Matteo Ricci in the 28th year of Wanli. There should be no way for a few years of Kungfu to be spread to the people, so Wanli Seven Years is ruled out.