During the reign of Renzong in the Northern Song Dynasty, there was a middle-level bureaucratic family in Bianjing (now Kaifeng) - the Su family of the seventh-rank Taichang Temple. According to the regulations of "History of the Song Dynasty, Yufu Zhi", the Su family's residence is called a "zhai" and has a four-story layout of a front house, an outer hall, a back hall, and a back garden. A corridor connects the hall and bedrooms, and there are side courtyards on both sides. At this time, the struggle between the old and new parties in the court was beginning to emerge, marriages between scholar-bureaucrat families were frequent, and the relationship between the back house and the court's interests was deeply bound.
