Introduction to the Civil Service: The six subjects correspond to the six-department official system established by the court after the Ming Dynasty. According to the rules of left civil and right military, the left side of the central axis is the three subjects of rites, household, and civil affairs, and the right side is the soldier , criminal, and industrial and martial arts subjects. The Civil Affairs Bureau is a specialized agency responsible for the promotion and transfer of officials under the jurisdiction of the government, as well as the registration of Jinshi and candidates in the office, and the management of the origin, composition, tenure, and seniority of local squires and local people serving as officials outside. It is equivalent to The current organization department. Ding You, an official, had his parents pass away and had to return to his hometown to observe mourning for three years to embody the etiquette of loyalty to the emperor and filial piety in feudal society.