Introduction to the Soviet Expert Building: On the afternoon of September 28, 1957, three men and one female blond foreigners came to Wanshan Tuping where the Hunan-Guizhou Mercury Mining Company is located. They were consultants sent by the Soviet expert team. group. The "Group of Four" is based in Wanshan and serves as the geological exploration technical consultant for the Hunan-Guizhou Mercury Mining Company in the area, helping with the work of the mercury mine. The Soviet expert building was built for them to live here. This small "Suzhou-style" foreign-style building with brick and wood structure faces south and faces north, forming a "mountain" shape. At the bottom of the "mountain" is a long two-story building with bungalows on both sides, five rooms on the left and right. They live there. The second floor here.