During the Song Dynasty, a diligent scholar named Gong Cheng studied diligently beside the tomb of a former official in Nanfeng Mountain from a young age. His life was austere, and he was constantly immersed in books. He possessed an exceptional memory; he could recite all the classics, commentaries, philosophical works, and historical records he had read, word for word. The local people, admiring his remarkable memory, gave him the nickname "You Jiao Shu Chu" (a walking library or a book cabinet with legs).