This is a work derived from Journey to the West. In the play, Zhu Bajie (played by Xu Zheng) was originally just a pig, but he has a human-like personality. Thinking, watching his companions being slaughtered one by one, he was unwilling to end his life, so he simply ran away while his master was not paying attention
Taibai Jinxing came from the sky to Renjian to capture the cat demon, but accidentally fell into a trap and temporarily lost his skills. He was rescued by accident, and after Taibai Jinxing knew that Zhu Bajie's wish was to become a human being, he promised to let him enjoy a day's life as a human being. But now that he has become a human, who wants to become a pig? Zhu Bajie did not return to Taibai Jinxing again as agreed, but ran away directly. Taibai Jinxing violated the rules of heaven and made Zhu Bajie a human. As a result, he had no choice but to chase after Zhu Bajie and the cat demon at the same time, but he was no match for the cat demon because he lost a lot of internal energy. Taishang Laojun saw all this from the sky, and knew that everything was God's will, so he simply gave Zhu Bajie the elixir, so that he has the kung fu to cooperate with Taibai Jinxing to hunt down the cat demon.