Cui Wenzi, Nana Ogawa's drinking buddy, often appears when Nana Ogawa is in urgent need of help. There are three evidences to suspect that he is from Beiyanshan.

First of all, when Nana Ogawa and Gao Yao just crossed to the Qin Dynasty and came to Tang Wushan to look for the treasure box, the people in North Wild Mountain asked them to meet again after a jiazi, indicating that he knew that Nana Ogawa and Gao Yao would eventually take the elixir, so they could return to Tang Wushan 60 years later, and it was Cui Wenzi who made the elixir.

Besides, Cui Wenzi likes to travel around the world. For example, when Qin Shihuang wanted to reward Cui Wenzi, he said that he only wanted two horses to travel around the world. When Gao Yao and Nana Ogawa visited Tang Wushan, the apprentice of Beiyanshan people also said that the master traveled around the world a month ago. This hobby two people have * * * in common, as if Cui Wenzi is from North Rock Mountain.

Third, the people of Beiyanshan have a lot of health knowledge in the recipe of Tang Wu left to future generations, which was later proved to be a medical book by archaeologists. As an imperial doctor, Cui Wenzi naturally knows the way of keeping in good health, so he once again pointed his finger at Cui Wenzi, a native of Beiyan Mountain.