Cause and effect cycle, retribution is unhappy. Maybe God saw that Xu Ming's life should not be cut off, and gave him a chance to start over again. When he returns to the Tang Dynasty in his dream, he will never see the Anshi Rebellion, Maweipo, or the disputes of the Five Dynasties and Ten Kingdoms. All he can see is the prosperous Tang Dynasty.
Purpose: Everyone has a dream of the prosperous Tang Dynasty.