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.
Yeomillak
Yeominrak, which means "Enjoyment with the People", was created based on Korean court music that the king shared to his people to be enjoyed together. This song was created during his 29th year of reign (1447) and actually had lyrics from the Yongbi eocheonga, but only the melodic component is existent today. It is usually played on Hangul Day in South Korea to celebrate the promulgation of Hangul by King Sejong, and also in religious services for the Ancestral Shrine of the Royal family, honoring the Royal Court, and for the Civil and Military authorities.