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.
Hangul
Another document published in 1446 and titled "Hunminjeong'eum Haerye" (""Hunminjeong'eum" Explanation and Examples") was discovered in 1940. This document explains that the design of the consonant letters is based on articulatory phonetics and the design of the vowel letters are based on the principles of "yin" and "yang" and vowel harmony.