During the Song Dynasty, people in the world were still sane and believed in ghosts and gods. They built temples one after another. Most of the people believed in witchcraft but not medicine, and worked with demons rather than kings.
Xiao Du (zidu) was born in such an era, and became close friends with Jiang Wei (hanchen), the deputy commander of the palace, and together they slayed demons.
The story begins from here,