Introduction to Yanggu County Yamen: Yamen is the official office where officials worked in ancient my country. It generally consists of a main entrance, a court hall, a back hall, etc. Almost all the plots involving "yamen" in "Water Margin" were filmed here, such as the Yuncheng County Yamen where Song Jiang worked as a police officer in time, and Wu Song and Wu Dutou worked in the Yamen.