Most alphabets evolved. They drift over centuries from pictographs to abstractions, no one quite remembers why a "B" looks the way it does. Hangul is not like that. Hangul has a birthday — 9 October 1446, the date its accompanying explanation, the Hunminjeongeum Haerye, was published. And it has a single, named inventor: King Sejong the Great (世宗大王, r. 1418–1450) of Joseon Korea, working with the scholars of his Hall of Worthies (集賢殿, Jiphyeonjeon).
Sejong's motivation is set out in the project's preface:
"The speech of our country is different from that of China and does not match the Chinese characters. Therefore, even if the ignorant want to communicate, many of them cannot express themselves. Thinking of this with pity, I have newly designed twenty-eight letters, wishing only that everyone may easily learn them and use them in their daily life." — King Sejong, Hunminjeongeum preface, 1446
Before Hangul, Koreans wrote in Hanja (classical Chinese characters), a system so demanding that literacy was effectively restricted to the male aristocratic yangban class. Sejong wanted a script the unlettered could learn in a single morning.
What he and his scholars produced is the most-cited example of a featural alphabet — a category proposed by Geoffrey Sampson in 1985 and not accepted by every scholar, John DeFrancis among the dissenters — meaning the shapes of the letters reflect the phonetic features of the sounds they represent:
- ㄱ (g/k) is a side view of the back of the tongue rising to block air at the soft palate.
- ㄴ (n) shows the tip of the tongue touching the alveolar ridge behind the teeth.
- ㅁ (m) is a closed mouth.
- ㅅ (s) is shaped like a tooth — the constriction is at the teeth.
- ㅇ (ng / silent) is a round, open throat.
- The aspirated version of each consonant is formed by adding a stroke (ㄱ → ㅋ, ㄷ → ㅌ, ㅂ → ㅍ); the tense version is formed by doubling the letter outright (ㄱ → ㄲ). Either way, the graphical complexity tracks the phonetic complexity.
The vowels are even more conceptual. They are built from three primitives: a horizontal line ─ (earth), a vertical line │ (man), and a dot · (heaven, later flattened into a short stroke). Combinations of these three Confucian elements give every Korean vowel: ㅏ, ㅓ, ㅗ, ㅜ, and so on.
The Korean Confucian elite hated it. The Hall of Worthies scholar Choe Manri submitted a famous 1444 memorial calling Hangul "Mongol- or barbarian-like" and warning that adopting a vernacular script would sever Korea from civilized (i.e. Chinese) learning. Sejong overruled him. Even so, after Sejong's death in 1450, Hangul was sidelined; King Yeonsangun banned it outright in 1504 after anonymous Hangul leaflets criticized him. For most of the next four centuries it survived as a "women's script" (amkeul) and a tool of popular literature, while serious scholarship continued in Hanja.
Hangul's true rehabilitation came at the end of the 19th century with reformer Ju Si-gyeong, who systematized its name (han-geul, "great script") and its modern orthography. After the Japanese colonial period — during which Hangul was again banned, this time by an outside power — South Korea declared Hangul Day (한글날) a national holiday. North Korea calls it Chosŏn'gŭl and observes its own holiday on 15 January. Modern Korean literacy is functionally 100%.
The linguist Geoffrey Sampson described Hangul in 1985 as "perhaps the most scientific system of writing in general use in any country". Its basic letter shapes can be learned quickly, although full reading and writing fluency still takes years. The Hunminjeongeum Haerye preserves an unusually detailed contemporary account of the script's design principles and intended use.