In 1443, King Sejong the Great unveiled a writing system of astonishing rationality. Unlike the borrowed Chinese characters that only scholars could master, 한글 was designed so that "a wise man can acquaint himself with them before the morning is over; a stupid man can learn them in the space of ten days."
Each consonant mirrors the shape of the speech organ that produces it: ㄱ traces the tongue's root, ㄴ maps the tongue touching the palate, ㅁ outlines the closed lips, ㅅ captures the teeth, and ㅇ echoes the open throat.
The vowels encode cosmology itself — the vertical stroke ㅣ represents a human standing, the horizontal ㅡ is the flat earth, and the dot (now a short stroke) ㆍ symbolizes the heavens. All vowels derive from combinations of these three elements.
Consonants and vowels combine into syllable blocks — ㅎ + ㅏ + ㄴ = 한 — each block a compact, self-contained unit of sound made visible. A writing system that is simultaneously a diagram of the human voice.
King Sejong creates Hunminjeongeum (훈민정음), "The Correct Sounds for the Instruction of the People" — 28 letters to give voice to a silenced populace.
The Hunminjeongeum is formally promulgated. The explanatory document reveals the scientific phonological reasoning behind each letter's shape.
King Yeonsangun bans the study and use of Hangeul after citizens use it to criticize his rule — proof that literacy itself is revolutionary.
Hangeul becomes the official script of Korea through the Gabo Reform, ending centuries of Chinese character dominance in official documents.
The Korean Language Society establishes the first "Hangeul Day" (한글날) on November 4th, later moved to October 9th — celebrating the alphabet's creation.
Hunminjeongeum Haerye (the original manuscript) is inscribed on UNESCO's Memory of the World Register, recognizing Hangeul's universal significance.