Mi Fei's Yan has a vertical volume of 36 cm and a horizontal volume of 138 cm. Historically, many people like Yan very much and are keen on collecting it. Therefore, Yan was collected by Jia Sidao, Ke, an appraiser of calligraphy and painting in Yuan Dynasty, and Yu Teng, an appraiser of calligraphy and painting in Qing Dynasty. Later, due to various reasons, Yan unfortunately drifted to Japan and was collected by museums around Japan. Then, on February 7, 2002, at 65,438, National Cultural Heritage Administration commissioned a unit to shoot it in the form of a directional solo at the Guanfu Museum at a price of 29.99 million RMB, and "Yan" finally returned to his native land.
Mi Fei has great attainments in calligraphy, especially in cursive script. Even Song Huizong was full of praise for Mi Fei's calligraphy, and was deeply loved by Song Huizong. He was named as a doctor of calligraphy and painting by Song Huizong. In Mi Fei's last works, Yan's calligraphy is considered to be the most representative, and it is called "the first difficult book in the world" together with Preface to Lanting Collection.
Besides calligraphy, Mi Fei has also made great achievements in painting and other arts. He can do some incredible things for art, so Mi Fei in history is also called Mi Dian.