At the end of the Eastern Han Dynasty, Zhong You was very persistent and enthusiastic about calligraphy learning, almost to the point of madness. It is said that he once studied in Baodu Mountain. In order to practice calligraphy well, he wrote down the stones and trees on the mountain in black. On one occasion, he talked with Cao Cao, Dan Wei and others about calligraphy pen. Because of his strong interest, he always painted before going to bed, and even cut several holes in the quilt.