Since the sword knight and other 15 people of destiny sealed the evil god "Chiyou", the three worlds of humans, gods and demons have been living in peace and contentment. The Tang Dynasty also prospered for a hundred years.
But for such peace, the people of destiny also sacrificed seven people in order to seal Chi You. Several of them have assimilated into the Xuanhuang Wuji Formation that sealed Chi You, and will forever guard Chi You with their souls. However, the remaining 8 people of destiny are still guarding our prosperous Tang Dynasty and peace in the three worlds. Although they have disappeared, if there is trouble in the world, they will reappear to help us get rid of the trouble.
This is the well-known story of Xuanzang of Tang Dynasty who went to obtain Buddhist scriptures.
