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.
Chinese family of scripts
The Hangul alphabet introduced in the 15th century was much simpler, and specifically designed for the sounds of Korean.
The alphabet makes systematic use of modifiers corresponding to features of Korean sounds.
Although Hangul is unrelated to Chinese characters, its letters are written in syllabic blocks that can be interspersed with Hanja. 
Such a Korean mixed script became the usual way of writing the language, with roots of Chinese origin denoted by Hanja and all other elements rendered in Hangul. Hanja is still used (but not very commonly like the Japanese) and is required in both North and South Korea.