Sisters Shi Yumeng and Shi Yumei returned to China from the United States with checks for the purchase of arms for the revolutionary army. In order to protect the revolutionary funds, the two sisters were in danger many times and fought wits and courage with the infantry commander Mu Liang. Because their father's identity as a revolutionary was exposed and he was killed, the two sisters had to embark on a life of fleeing. The younger sister Shi Yumeng and the nobleman Guo Biyu admired each other, but she accidentally killed Guo Biyu's father during a mission. Guo Biyu began to smoke opium because of excessive self-blame and pain, which made Yumeng very upset. Mu Liang retaliated against the revolutionary party crazily, and the mother of the Yumei sisters was killed. After getting rid of Mu Liang, Yumei discovered that her lover He Yunnan was a spy. When Yumei was desperate, Du Yichun, who had always loved Yumei but dared not show it, saved Yumei and promised to take care of Yumei. Lovers finally got married.