In the early Ming Dynasty, Xia Xun, a commoner, accidentally replaced the deceased wealthy scholar Yang Xu and became a pawn of the Jinyiwei. After witnessing the cruelty of his monitor Zhang Shisan and others, he decided to protect himself and eliminate harm for the people. At the same time, he met his future wife Xie Yufei, and the two began to get along like a pair of happy enemies. Soon, Xia Xun was chased by the Jinyiwei on the way back to his hometown, so he was rescued by Ximen Lang and Ji Gang, and the three of them became sworn brothers at first sight. The latter three accidentally saved the King of Yan and his wife and the princess, and Xia Xun's ability attracted the attention of the leaders of the two factions of Jinyiwei, Bai Yixia and Luo Kedi. Xia Xun was trained by Bai Yixia and Luo Kedi and became an excellent Jinyiwei. After Zhu Yunwen ascended the throne, he began to work on reducing the vassal state. Xia Xun, who was concerned about his country, decided to assist the King of Yan to ascend the throne in order to prevent the people from suffering more. He and Ji Gang cooperated perfectly with the King of Yan and made great contributions to the King of Yan's enthronement in the future.