Shen Zhitang, a formidable woman from the capital, marries Xie Huaiheng, a widowed Grand Tutor, and becomes the stepmother of his five-year-old son, Xie Yun'an. After entering the household, she discovers that her stepson is being mistreated by the people in the residence, and that the circumstances surrounding his biological mother's death are highly suspicious. Fearlessly protecting the child, she smashes the study, drives out the wicked tutor, and stands her ground against the Old Madam and traitors within the household. With the Empress's help, she investigates the old case, exposes the masterminds behind the conspiracy, including the Earl of Yongning, before the imperial court, and finally clears the family's name. In the end, she protects her stepson until he grows up safely and achieves top honors in the imperial examinations, bringing peace and stability to the entire family.