Gatekeeper of the Underworld

In a world as dark as night, people are always fearful and longing for the light. There is a kind of person who is right next to you, who seems to be just like you, but when no one knows about it, he is guarding a place of monsters and monsters. The iron certificate of the ancestral alchemy book. Different stories of the Chen family's ancestors are circulated from generation to generation. It seems like a curse. Unable to escape the fate of imprisonment. One day. Chen Jianghe opened the Iron Book of Alchemy. A different story begins.