Xu Qingyan, granddaughter of the Grand General Who Guards the North, takes refuge in Qingfeng Stronghold with her younger half-sister after her family is falsely accused, eventually becoming the stronghold's leader. In secret, she passes military intelligence to the new emperor, Liu Mohan, and earns great merit for helping him ascend the throne. Yet the man she has loved for three years, Gu Chengze, her husband at the stronghold, betrays her alongside her half-sister, Xu Rourou. The two deceive her into signing a confession, intending to trade her life for their own advancement. Ultimately, Xu Qingyan is cleared of all charges and honored with the title of County Lady. She and Liu Mohan find happiness together, while the villains suffer disgrace and ruin.