During the reign of Datang Guangzhai, there was a mysterious and illusory pavilion at the junction of yin and yang in the west city. In the dimly discernible pavilion, selling rare treasures, worldly desires. People, devils, ghosts and charms come here. The ethereal pavilion is a castle in the air that seems to be real and unreal. Many people want to get fame and benefits from it, while others want to get real love.