The Tang Priest drove Wukong away because he killed the highwayman. After the Monkey King left, he went to Guanyin. Liu Er the Monkey King took the opportunity to turn into Wukong, wounded the Tang Priest, snatched the luggage, and turned the little demon into Tang Priest, Bajie and Friar Sand in an attempt to learn Buddhist scriptures in the Western Heaven. Friar Sand went to ask Guanyin Bodhisattva, and Wukong and Friar Sand went back to find out. Who knows it's really hard to tell the truth from the false? It was not until the Tathagata of Leiyin Temple that the Buddha revealed the fake Wukong. The Monkey King killed him and gave it back to the Tang Priest.

I hope it helps you.