This anonymous book was printed sometime in the reign of King Taejong, Joseon Dynasty (1402-1418) with gyemidonghwalja, the first metal type font invented in 1403. It is a single book with 12 chapters, measuring 19cm wide and 29cm long. Some parts of chapter 10, 11 and 12 are in poor condition and the rear cover of the book is missing. Instead of the back cover, a piece of blank paper is inserted into the front and rear end of the book and a dark yellow cover is added, and the book is re-bound in red cotton cloth. It is one of the rare books printed with gyemidonghwalja, serving as an excellent material for studying early metal types.