In the flourishing Yin Dynasty, several mystical murder cases by fire occur in Daye, the capital. All of them are strange, terrifying, and mysterious. Shi Hao Xuan from Tianzhao Prefecture and Xuan Kun of the City God Temple get involved to find out the truth. Solving the enigmas, they discover the truth about the Fire Case of 20 years ago that exterminate the whole family, while a secret file reveals their identities. A series of delicately planned conspiracies are unveiled amidst hatred and ambitions.