Introduction to Shen Wansan's former residence: Shen Wansan was the richest businessman in Jiangnan in the late Yuan and early Ming dynasties. The cultural celebrity Yu Qiuyu was known as the financial master of the 14th century. He once funded the construction of Tuoguanqian Street and helped Zhu Yuanzhang build one-third of the Nanjing City Wall. Tianlong Tunbao was Shen Wansan's last home in his life.