Introduction to the Butler Courtyard: The place where the stewards of the Prime Minister's Mansion work and live. The buildings are all single-story structures, simple and simple, contrasting with the gorgeously decorated main building, which makes the feudal society "differentiated between superior and inferior, superior and inferior." The traditional etiquette concept of "equal" has been fully reflected. The word "Ducheng" is engraved on the lintel, which is the criterion for selecting housekeepers in the Prime Minister's Mansion.