This book contains information on the members of an association formed by officials from six government agencies in charge of acquiring and providing supplies for the royal court. It is now famous for its postscript, which was written by Yi Sik (1584-1647), one of the Four Masters of the Chinese Classics, along with Sin Heum (1566-1628), Yi Jeong-gu (1564-1635), and Jang Yu (1587-1638). Written in 1635 when he was 52 years old, the handwritten postscript exhibits impressively powerful strokes in the “modern cursive script”. His calligraphy is tidy and subtle and displays a clearly defined rhythm and balance between the use of “square brushes” and “circular brushes”.