-The mystery of immortality: Xu Chang has lived for more than three thousand years, and his appearance always remains around thirty years old. He has extraordinary strength and wisdom, but cannot reveal his true identity to anyone.
-Historical witness: As a disciple of the alchemist of the Qin Dynasty, Xu Changsheng participated in many major historical events, from the construction of the Great Wall to the Renaissance, leaving his footprints in every era but no one remembers him.
