Tan Yunxian is an intelligent and observant young girl living in Ming dynasty China. Following the premature death of her mother, she relocates to her grandparents' estate, where she discovers an aptitude for traditional medicine. She struggles to balance the strict Confucian expectations of a high-class woman, such as social seclusion and the pressure to bear sons, with her desire to practice medicine. She holds deep compassion for people in pain and seeks to offer material assistance whenever she encounters suffering.

Shi Meiling is the energetic and curious daughter of a local midwife. Because she works in a physical trade, her feet remain unbound. This physical freedom allows her to run and play in ways high-born ladies cannot. She acts as a vital link to the outside world for her sheltered friend Yunxian and aspires to build a successful career as a medical professional.

Grandmother Ru is the respected matriarch of the Tan family's Wuxi estate and a skilled practitioner of hereditary medicine. Unlike her husband who relies entirely on textbooks, she treats patients using practical knowledge handed down through generations. She recognizes Yunxian's potential early on and trains the young girl in pulse diagnosis. She believes deeply in the philosophical concept of bodily balance.

Lady Kuo is the strict mother-in-law who presides over the Yang household at the Garden of Fragrant Delights. She expects absolute adherence to hierarchical rules and believes a wife's sole duties are to serve the family and produce male heirs. She prefers the official family physician over female practitioners and actively restricts any behavior she deems improper for an upper-class woman.

Miss Zhao is a concubine in the Tan household and the biological mother of Yunxian's half-brother. After Respectful Lady falls fatally ill, she steps in to chaperone Yunxian on the journey to Wuxi. She offers pragmatic advice about the precarious nature of a woman's life and encourages the building of female alliances for personal survival.

Respectful Lady is Yunxian's mother and the primary wife of Master Tan. She spends her days confined to the inner rooms of her home in Laizhou, suffering from the physical toll of her bound feet. She passes down traditional Confucian values to her daughter and teaches her that a woman's lot is to endure quietly.

Master Tan is an imperial government official who frequently travels to take exams or serve in government posts. He commands the ultimate household authority but remains distant from the daily lives of the women in his family. He upholds societal norms regarding gender segregation and focuses his attention on his professional advancement.

Yifeng is the son of Miss Zhao and the acknowledged male heir of the Tan household. Because he is a boy, he holds a privileged position within the family structure. During his early childhood, he requires academic assistance from his older half-sister to complete his lessons.

Poppy is Yunxian's personal maidservant. Originally raised by a Tooth Lady to be sold as a concubine, she refused to bind her feet, which lowered her financial value to that of a laborer. She provides practical assistance and loyalty to Yunxian as they adapt to the rules of new households together.

Grandfather Tan is a wealthy patriarch who studies and practices medicine from ancient texts. He maintains a large household with several concubines and highly values formal academic knowledge. He respects his wife's practical healing skills and creates a harmonious professional environment in the Mansion of Golden Light.

Midwife Shi is Meiling's mother and a working-class woman who handles the physical aspects of childbirth that elite doctors avoid. She faces social stigma due to her profession but possesses crucial practical skills for delivering babies safely. She frequently collaborates with Grandmother Ru on difficult pregnancy cases.

Yang Maoren is the gentle son of a wealthy silk merchant family. As Yunxian's husband, he treats her kindly but focuses heavily on his path toward passing the imperial exams. He expects his household to run smoothly and accepts the traditional family hierarchies managed by his mother.

Doctor Wong is the official male physician employed by the Yang family. He relies on established male medical authority and resents interference from midwives or female practitioners. He maintains a close alliance with Lady Kuo to secure his lucrative and powerful position within the estate.

Miss Chen is a concubine in the Yang household who becomes pregnant at the same time as Yunxian. She operates within the competitive atmosphere of the inner rooms by seeking favor and securing her position through childbearing. She keeps herself informed about political events outside the compound walls.

Spinster Aunt is an older, unmarried woman living in the Yang compound who helps with domestic tasks and childbirth recovery. She quietly observes the secretive dynamics of the inner chambers while assisting the women during their vulnerable postpartum periods.

Yining is a young girl living in the Yang household who suffers from severe digestive issues. Her illness provides Yunxian an early opportunity to practice diagnostic skills in her new home, although treating the girl draws immediate disapproval from Lady Kuo.

Lady Huang is the wife of a nephew in the Tan family who resides at the Mansion of Golden Light. Her pregnancy serves as one of Yunxian's first observational lessons in women's medicine. Her care requires collaborative effort between the family doctors and the local midwife.