Hangul supremacy
Hangul supremacy is the belief, most widespread in Korea, that the Hangul alphabet developed by King Sejong the Great's Hall of Worthies in 1443 is the simplest, most logical, most beautiful and most scientific of the world's writing systems. In its extreme form, the belief holds that Hangul is in fact best suited for the expression of sounds in all languages.
Choe Sejin
Choe Sejin is mostly known for his 1527 work, "Hunmong Jahoe" (훈몽자회). It is a textbook for children to learn the Chinese characters, and is known to be very practical in its teachings. During the Joseon Era, literacy in Chinese was an essential skill for advancement in society. Chinese was the dominant language of literature at this time, and children were taught Chinese from an early age to prepare for the future. Although hangul, the Korean orthography, existed by this time, it was not widely used in the country. Choe wanted to promote the usage of hangul through his work "Hunmong Jahoe". As a textbook for children to learn Chinese, "Hunmong Jahoe" incorporated hangul in the textbook to promote both the learning of Chinese characters, as well as hangul. The Chinese characters were annotated in hangul, and in order for one to understand and learn the Chinese characters, one must have a full grasp of hangul first to comprehend the annotations. Choe wanted people to use hangul more extensively, and he thought that this would encourage people to take some time to fully learn hangul, before starting to learn Chinese. He wrote that "it would take [only a single day] to learn Hangul", commenting on the simplicity of hangul, and afterwards, one would be able to learn Chinese on their own without an instructor if one knew hangul and utilized his textbook.