Du Xiaoyue met Ji Xiaolan in the process of vindicating Yunzhou people with Mochow's sister, and was impressed by his extraordinary wisdom, talent, courage and integrity, and followed him ever since.
Later, she went to the palace to meet the queen mother, who was deeply loved by her. Later, she was adopted by the Queen Mother and named Yue Ming Gege.
Extended data:
Du Xiaoyue is gentle and considerate. There is a trace of justice, a heroine among women. Handsome and cute. Do whatever you want. Deeply loved by Qianlong and the empress dowager.
In the contest between Ji Xiaolan and Iron Tooth and Copper Tooth 2, Du Xiaoyue returned to Ji Xiaolan's side. In the third film, Du Xiaoyue didn't appear, but she just mentioned that she got married in Gansu.
In Ji Xiaolan 4 with Iron Teeth and Copper Teeth, Du Xiaoyue's "xianggong" was unjustly imprisoned, so she once again returned to Beijing as a member of the troupe to avenge "xianggong".
But "xianggong" was finally silenced, so desperate Du Xiaoyue returned to Yuewei Caotang and Ji Xiaolan's side again.
References:
Du Xiaoyue-Baidu encyclopedia