In a parallel world with the modern city as the surface and the Mohist machine arts + Xuanmen Taoism as its core, there are two major forces, the "Tianji Pavilion" and the "Mokist Underground Palace". In pursuit of eternal life, the Mohist tycoon secretly manipulates the fortune telling of the underworld and uses bronze puppets to arrest souls and refine weapons; Tianji Pavilion takes protecting the order of the world as its own responsibility and practices "Lianshanyi" to deduce the secrets of heaven. The "Jiang City" where the story takes place is actually the junction of Yin and Yang, and a thousand-year-old organ city of the Mohist family is buried underground.
