Evan Lane, the reincarnation of the Demon Emperor, lives as a mortal, only to be drawn into conflicts between immortals and demons. Princess Zara, the Zhaoning Princess, protects him. Three hundred years of feuds are intertwined with the Demon Slaying Edict, the old shadow of the Demon Emperor lingers, and bloody unrest breaks out again in the mortal realm. The two join forces to fight powerful enemies, the confrontation between the mortal world and the Heavenly Court escalates.