The warlord's mansion fourth young miss Yan Yaoyao was a military industry expert in her past life, but in this life she is seen as good for nothing, suffering humiliation when Xie Xuandu breaks off their engagement. When bandits raid by night, she makes a name for herself with a single shot, takes charge of the armory, modifies firearms to thoroughly crush Xie Xuandu and the bandit mob. With his hand broken, Xie Xuandu flees to Beiping to lean on Marshal Gu, and colludes with Chamber of Commerce president Xiao Hechuan, tricking the third sister into stealing blueprints and poisoning to silence witnesses. Yan Yaoyao roots out the internal spy and publicly subdues Xiao Hechuan. Beiping special envoy Lu Chengyan presses her with an arsenal and blueprints, ultimately forming an alliance with her—she provides the guns, he provides the men, and three months later they jointly settle the thirteen southern provinces. Xie Xuandu calls with a provocation; she burns the telegram, waiting only to finish him off with her own hands.