Zhang Yu's book collection is real.

Yuan writer, bibliophile, calligrapher and Taoist. In his early years, his real name was Zhang Tianyu, also known as Zhang Sizhen. Apollo, alias Zhen Ju, Tian Yu, Tianyu, Zhen Juzi and Zhen Ju Ren Zhen, alias Waishi, are descendants of Zhang Jiucheng. Qiantang (now Hangzhou, Zhejiang) people. He studied under Wang Shouyan and was recommended to the capital. He is a bachelor of Hanlin and is famous for his calligraphy, painting and poetry. In his later years, he lived in Sanmao Temple, studied the history of metaphysics and recorded the Taoist nobles of past dynasties. It is also called "Huang Zi House" to store the history of ancient books. Also in the south of the bridge as a "library stone room", full of ancient books. The book collection is printed with "History of Songs". Unfortunately, at the end of Yuan Dynasty, the collection of books was destroyed by war. He is the author of Origin Collection, Biyan Xuanhui Record, Searching for Mountains, Zhenju Collection (also known as the Collection of Foreign History of Juqu) and Maoshan Collection.