Introduction to the second hall: Also called the back hall, it is the place where Yan Shengggong met with officials of fourth rank and above, and where he was entrusted by the emperor to examine etiquette for the court in the first year and to entertain children. " and " Poems, Books, Ritual and Music" are large plaques, with several stone tablets standing on both sides. Between the two ends of the second hall, there is the Announcement Hall in the east and the Official Assistant Hall in the west.