In an era when the demons are in power, they are the masters of the despicable cultivators and mortals. The cultivator elders deem it necessary to send someone back in time to determine the origin of the demon lord and to prevent his awakening. Li Susu accepts the mission, becoming the mortal Ye Xiwu, General Ye's third daughter, who is married to Tantai Jin, the hostage prince and future demon lord. She is determined to destroy Tantai Jin, who, in the future, will massacre many. But as a witness to Tantai Jin's past life and rise to power, an unexpected tale emerges, one complicating her quest.