Excellent agent Jiang Xiyao encountered danger while carrying out a mission, and her soul transmigrated into that of a princess of Daxi Kingdom. She was ordered by the emperor to marry Prince Zhan Shen Qingheng. At that time, Shen Qingheng was engaged in a battle with the enemy country of Xiqi. Jiang Xiyao, in order to protect the people of Daxi and maintain peace on the border, scraped the bones and treated the wounded general with poison, designed weapons, and made explosives to help Shen Qingheng defeat the enemy. After winning, Jiang Xiyao once again utilized her knowledge in modern times by running a buffet to alleviate the urgent shortage of food at the border. She used surgical treatment to cure the prince and made mahjong to help the empress dowager prevent dementia in old age. During the process, she also resolved misunderstandings with Shen Qingheng. The two worked together to uncover the conspiracy of evil people and eventually became a couple