During the Yongle period, Ji Gang was in charge of the military affairs and the royal guards. Because he was favored by Chengzu of the Ming Dynasty, he became a powerful official. Chengzu of the later Ming Dynasty was afraid that Ji Gang's monopoly would endanger the world, so he appointed Li You, the son of Cao Guogong, to serve as the imperial guard to investigate the evidence of Ji Gang's crimes. Zhou Nianzhi, the daughter of the minister of Dali Temple, had a marriage contract with Li You. Because Zhou Zhiqing, the minister of Dali Temple, did not want to marry Cao Guogong, he had been dressing up in men's clothing since his birth. The two had known each other since childhood, but they could not express their feelings for each other because of Zhou Wangzhi's identity. Together with their friend Xu Zhaoting, the two repeatedly solved murder cases, searched for evidence of Ji Gang's crimes, and finally brought him to justice. After all kinds of hardships, the three of them also found their own happiness.
Purpose: Young people use their passion to solve strange cases, conquer Mobei, rescue victims, and punish traitors