The Witch God Sect Leader was very confident in persuading Pei Xuanjing to cooperate, as there was no grudge or animosity between them.
Perhaps some people may think that Wu Shijiu is a defector from the Witch Deity Teaching, and since Wu Shijiu has a close relationship with the Great Ming Divine Dynasty and is acquainted with Pei Xuanjing, it would seem as though Pei Xuanjing and the Witch Deity Teaching ought to be on opposing sides.
This is not true, it's just a misunderstanding. Wu Shijiu and the Great Ming Divine Dynasty are intertwined due to mutual interests and not necessarily because of a deep-seated bond. Even if there were such a bond, how would it matter?
Despite being the National Teacher of the Great Ming Divine Dynasty, Pei Xuanjing primarily identifies as the leader of the Taoist School and the head of the Shenxiao Sect. His connection with the Great Ming Divine Dynasty is also primarily based on mutual interests.