If you look at the Annals of the Joseon Dynasty in the 17th century during King Sukjong's reign, people first learn the Hangul (At this time, it was called 'Eonmun(諺文)'). And then learn the Chinese language(千字文, etc), but there is a record that high-ranking officials are concerned about as young people nowadays could not interpret the Confucian texts in Chinese characters well because of learning Eonmun from an early age. Judging from this, it can be said that proper dissemination was already made in the mid-Joseon Dynasty (16~17C). Hong Gil-dongjeon, representative classic novel of Korea, is also a novel written in Korean letter in the 16th century.