Yun Lei's grandfather Yun Jing was detained by Zhang Zongzhou for many years during his mission to the Wa State on behalf of the Ming Dynasty, and later died as a result of being punished by Emperor Yingzong of Ming. Yun Lei swears to avenge him. Disguised as a man, Yun Lei goes to Beijing to find her long-lost brother Yun Zhong, and meets Zhang Danfeng and Shi Cuifeng, which leads to a series of complications. Eventually, Zhang Danfeng decides to abandon his personal grudges and prioritizes sending a map of military affairs to the official Yu Qian, while resolving to resolve the feud between the Zhang and Yun families in his own way.