If the Anshi Rebellion Happened in the World of Xianxia

Taking the Anshi Rebellion (before the Lingbao War) as the background, and using reasoning to string together the main plot, it builds an imaginary world of Xianxia + earth on the basis of the history of the Tang Dynasty. The world of Xianxia is unknown to the world. The core clue of the story is that the villain intends to interfere with the development of the world.