Nan Li's real name was Zhang Guiyun, and her ex-husband had to obey the Germans. She thought Zhang Guiyun's name was too corny, so she was nicknamed "Nan Li". After Fan Ceng got Li Nan, he changed it to "Li Nan", a professor-level senior engineer with a master's degree. She is engaged in the teaching and scientific research of polymer materials and engineering, mainly responsible for the teaching of polymer physics, polymer materials forming and processing foundation, polymer materials forming and processing equipment, plastic products and forming, polymer materials research progress and other courses.

According to Xu Zunde, Zhang Guiyun is a native of Northeast China and speaks a strong dialect on weekdays. He has a sister named Zhang Guizhi, a brother named Guixing Zhang who works in Anhui, and a dead sister. All Nan Li's current identity documents are forged, including her current identity card.

Zhang Guiyun actually had a marriage history before marrying Zunde on 1962, but Zunde didn't know about it until the day they got the marriage certificate. Zunde's mother later learned that Nan Li had concealed her marriage history and was very angry and unacceptable.

1988, 50-year-old Xu Zunde and 49-year-old Nan Li divorced in Beijing. 1993, Fan Ceng and Nan Li got married as they wished.

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Fan Ceng's third wife:

Fan Ceng's feelings for Nan Li can be said to be fiery and straightforward. At that time, they flew to Paris together Fan Ceng also confessed to everyone: "I am willing to go to the ends of the earth with Nan Li who has been in love for 20 years." At that time, for the sake of this relationship, Fan Ceng even cut off the father-daughter relationship with his own daughter, and Nan Li's two sons also took Fan Ceng's surname and recognized him as their father.