To protect her family's noble title, He Yan, the eldest daughter of the He family, is forced to don a mask and pose as the family's eldest son, "He Ru Fei." As a young girl, He Yan first meets the brilliant scholar Xiao Jue at Xianchang Academy. Determined to escape her family's fate, she leaves the academy and heads to the battlefield. Years later, He Yan returns home as a celebrated hero, only to be betrayed by her family when her brother He Ru Fei reappears. Surviving the treachery, He Yan assumes a new identity as He Yan, the daughter of a city gate officer, and disguises herself as a man to join the military in Yezhou, vowing to reclaim everything that was taken from her.