It all begins in an era when demons hold power and are destroying cultivators and mortals. The elder cultivators believe it is necessary to send someone back in time to understand how the Demon God came into being and, if possible, to prevent his rise to power. Li Su Su accepts the mission, becoming the mortal Ye Xi Wu, the third daughter of General Ye, married to Tantai Jin, a prince of the Jing Kingdom who was given as a hostage to her Kingdom and who will become the Demon God. Our heroine is determined to destroy Tantai Jin, who will go on to slaughter many in the future. But as his wife, she witnesses Tantai Jin’s past life and his rise to power, uncovering an unexpected story that complicates everything.