When King Sejong the Great promulgated Hangeul in 1446 -- after creating the writing system in 1443 -- the announcement was accompanied by the publication of "Hunminjeongeum Haerye," a book written by the king and eight scholars involved in the creation of Hangeul that explains the creation of Hangeul and the principles behind its letters and the writing system. The book was written in Hanja, or Chinese ch...