Spiritual energy is resurging across the globe, and ancient demons have returned to wreak havoc upon the world. After stumbling upon a tiger-engraved waist token from the reign of Emperor Wu of Han, a young man named Wei Yuan becomes the last Colonel-Director of Retainers of the modern era.

Within the Jiangnan Folklore Museum where he resides, countless demons and ghosts are sealed away—each artifact linked to a hidden secret of history. With an octagonal Han sword, he slays every evil spirit in his path, witnessing the supernatural mysteries of the ages as the Colonel-Director of Retainers…