The story is set in a fantasy world where humans, ghosts, demons, and Tao coexist. The underworld is in charge of the order of the underworld, and the yin and yang gates are responsible for maintaining the balance of yin and yang. During the Ghost Festival, the underworld opens its gates to ghosts, allowing ghosts to return to the light for a short time. However, many hidden dangers and conspiracies are hidden, and various forces are ready to move, laying the groundwork for the subsequent development of the story.
