In an imperial court, a 17-year-old girl named Maomao is abducted and forced to toil as a servant in the emperor's palace. Undeterred, she maintains her inquisitive nature and practical mindset, biding her time until her servitude ends. When she learns of the emperor's ailing infants, Maomao, a skilled pharmacist from a deprived district, intervenes covertly. Despite her efforts to stay hidden, her talents attract the attention of Jinshi, a powerful eunuch. As Maomao navigates the inner court, her unorthodox methods and medical prowess earn her a reputation for unraveling enigmatic health puzzles.