During the Anti-Japanese War in Shanghai, the progressive young woman Han Shuying was framed by her aunt and forced to marry the tycoon Xie Bingyan of northern Jiangsu as a concubine. Inspired by the patriotic teacher Li Wenxuan, Han Shuying decided to escape from marriage and join the ranks of saving the country, but was discovered by Xie Ruoxue, the eldest daughter of the Xie family, because of her classmate relationship with Xie Tianci, the eldest son of the Xie family. The domineering Xie Ruoxue not only reported to her father, but also interpreted Han Shuying's "escape from marriage" as "elopement", trying to put Han Shuying, the "stepmother", to death. Just when Han Shuying's life was hanging by a thread, Xie Bingyan was shot by the Japanese for not wanting to betray his motherland. Han Shuying, who witnessed everything, was deeply moved by Xie Bingyan's patriotism and resolutely chose to stay in the Xie family. In the name of Mrs. Xie, she saved the Xie family and fled to Shanghai with Xie Ruoxue with the help of Li Wenxuan, and moved Xie Ruoxue with practical actions. Against the backdrop of an era of war and iron cavalry, Han Shuying and Xie Ruoxue, the two women, not only depended on each other as "mother and daughter", but also as "sisters" interpreted a legend of fighting against Japan and saving the country.