Guo Wenbin, a military engineering doctorate and special forces veteran from the modern era, and Guo Qinghe, a female special forces captain, unexpectedly travel back in time during a mission and find themselves in the bodies of a 19-year-old pair of fraternal twins at the Dingyuan Marquis's residence in the Northern Song Dynasty. Every adult man in the loyal Dingyuan Marquis household has died fighting on the frontier, leaving only Zhou Wenbin, Shen Qinghe, and the widowed women of the family. Having taken over the siblings' bodies, Zhou Wenbin and Shen Qinghe resolve to change the future of the Dingyuan Marquis's household.