Set in the ancient capital Luoyang during the era of 13 dynasties, it revolves around three people who come together to investigate a series of mysterious incidents involving the conspiracy to overthrow Empress Wu Ze Tian. Adapted from the novel Luoyang by Ma Bo Yong.

During the Wu Zhou period, Wu Zetian's imperial examination system severely hindered the interests of the traditional aristocrats. They were prepared to prevent Wu Zetian from ascending the throne. The protagonist Pei Kun came to the divine city Luoyang and got entangled in the "fox demon" case as a wanted man.