To go to Qiankun, you must first complete the missions of Wujie in Hanzhong County to find Zhu Guo and Qianli to save his son. In this way, you can get the "Baicao Jing". Take the "Baicao Jing" to Handan to find Chun Yuqiu and help her Complete the task of killing the demon beasts to get the "Book of Beasts" to get "Wei Liao's Art of War". Take the art of war and go to Chencheng to give it to Wei Liaozi who is located above the map of Chencheng. This will allow you to enter the Qiankun Palace. The success of An Qisheng in the fifth-level mission has nothing to do with whether he can enter the Qiankun Palace.