Later, Ch'oe Yi published 28 copies of this book with movable metal type and sent them to be kept in several local governments' offices.
[2] Also, owing to a long history of woodblock printing, Koreans of the period were accustomed to books, and literacy was high.
The Chinese visitor Xü Jing, visiting Korea in 1123, observed in his travelogue that Koreans considered it shameful not to be able to read.
[3] Goryeo kingdom records indicate that a major printing effort, the 50 volume Sangjeong Gogeum Yemun (Prescribed Ritual Text of the Past and Present) was printed with cast metal around the 21st year of reign of King Gojong of the Goryeo dynasty (around 1234 AD).
Another major publication, Nammyongcheonhwasang - Songjungdoga (Sermons of Song period Buddhist Priest Nammyongvhon) was printed with cast metal type in the 26th year of the reign of king Gojong (1239 AD).