In order to complete the restoration of the national treasure "Dunhuang Star Map", Shen Nian, a modern ancient book restorer, accidentally got involved in a sadistic love affair with Pei Yan, a border guard general from a thousand years ago. He betrayed her for Chang'an, and she burned herself for history. When he was reborn in modern times looking for her thousands of years later with the consciousness of "crematorium", he found that she was no longer the silly girl who only waited outside the Yumen Pass.
