In an era when demons have dominion over cultivators and mortals, the cultivator elders believe it is imperative to send someone back in time to discover the origin of the demon lord and prevent his resurrection. Li Su Su accepts the mission and assumes the identity of mortal Ye Xi Wu, the second daughter of General Ye. She's married to Tantai Jin, the captive prince and future demon lord, and is determined to destroy him, aware that in the future he will come to massacre many. But as witness to Tantai Jin's past life and rise to power, an unexpected tale emerges, one complicating her quest.