Yes, Zhan Doudou knew that Priest He was the leader of the spies. In " Celebrating Years," Zhan Doudou learned that Daoist He had gone to see Fan Xian and discovered that he was the head of Northern Qi's spies. She had learned this information from Lang Tiao and was able to deduce that Friar He would be the head spy after Yan Bingyun. Zhan Doudou had some understanding of Priest He's real situation, and he was able to make an accurate judgment. Therefore, it could be said that Zhan Doudou knew that Priest He was the head of the spies.
Zhan Doudou learned about Priest He through his discussion with Lang Tiao. After Shen Zhong's fall, Zhan Doudou and Lang Tiao knew exactly where Friar He was. Zhan Doudou knew that he and Fan Xian were on the same boat and knew Friar He's situation like the back of his hand. Although Zhan Doudou and Friar He had no conflict of interest for the time being, she could deduce that Friar He would become the head of Northern Qi's spies. This showed that Zhan Doudou's defenses and schemes in Northern Qi could not be underestimated.
Zhan Doudou learned about Priest He through his discussion with Lang Tiao. After Shen Zhong's fall, Zhan Doudou and Lang Tiao knew exactly where Friar He was. Zhan Doudou knew that he and Fan Xian were on the same boat and knew Friar He's situation like the back of his hand. Although Zhan Doudou and Friar He didn't have any conflict of interest, she could infer Friar He's situation.
Zhan Doudou learned about Priest He through his discussion with Lang Tiao. After Shen Zhong's fall, Zhan Doudou and Lang Tiao knew exactly where Friar He was. Zhan Doudou knew that he and Fan Xian were on the same boat and knew Friar He's situation like the back of his hand. Although Zhan Doudou and Friar He had no conflict of interest for the time being, she could deduce that Friar He would become the head of Northern Qi's spies. This showed that Zhan Doudou's defenses and schemes in Northern Qi could not be underestimated. Therefore, according to the information provided, it could be said that Zhan Doudou learned about Friar He's situation through a discussion with Lang Tiao.
Friar He was the leader of the spies when he was discovered. The Northern Qi Emperor had guessed Friar He's identity in advance. He had become the head of Fan Xian's spies. As for how Friar He would take the next step, he would have to wait for the second season's update to know.
Fan Xian knew in which chapter of the novel " Celebrating Years " that Zhan Doudou was a woman. It was only after a long time that Fan Xian learned that Zhan Doudou was a woman, but he did not explicitly mention which chapter. Thus, according to the information provided, it was impossible to determine which chapter Fan Xian knew Zhan Doudou was a woman.
In the novel," Celebrating Years," Fan Xian did not mention in which chapter he knew that Zhan Doudou was a woman.
Fan Xian had found out that Zhan Doudou was a woman in chapters 71 and 72 of the sixth volume of the novel," Celebrating Years."
Fan Xian only learned that Zhan Doudou was a woman a long time later in the novel " Celebrating Years." The specific chapter was not mentioned.
Fan Xian was a spy for Nanqing in Northern Qi in " Celebrating Years." He took over the Qing Kingdom's undercover work in Northern Qi and discovered the cooperation between the Northern Qi palace treasury and the shops. Fan Xian told this secret to the empress dowager and unveiled this cooperation model. However, the search results did not mention the identity of the head of Northern Qi's spies. Thus, I don't know who the head of the Northern Qi spies is.
In "Celebrating Years," the leader of the spies in Northern Qi was Daoist He.