Shen Yian, a modern social creature, traveled through time and became the sixth prince of Daqian. He refused to marry the ambitious Gu Ruoyi and insisted on marrying Ye Liyan, a female demon who was dismissed as "ominous". He planned to ambush the villain, accumulate power, and help Ye Liyan grow up, and the two had a deep love. Faced with harem conspiracies, princely disputes and Zhao family rebellion, Shen Yi'an joined hands with Ye Liyan and his allies to put an end to the chaos, and was eventually granted the title of King Protector of the Country, guarding the peaceful and prosperous era of Daqian together with Ye Liyan.
