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Most writing systems are accidents of history. The Latin alphabet you're reading now descends from Phoenician traders scratching symbols into clay 3,000 years ago. Chinese characters evolved from oracle bone carvings meant to communicate with ancestors. Japanese kana emerged when monks simplified Chinese characters for speed. None of them were designed. They evolved, messily, over millennia.
Korean's alphabet was engineered. By a king. On purpose.
In 15th-century Korea, literacy was reserved for elites who'd spent years mastering Classical Chinese characters. The vast majority of Koreans couldn't read or write. King Sejong the Great — a polymath whose court reformed land taxation and produced one of the world's earliest standardized rain gauges — decided this was unacceptable.
His stated goal in the Hunmin Jeong-eum, the 1446 document introducing the new script, was blunt: "The sounds of our language are different from those of Chinese, and so our people cannot express their thoughts using Chinese characters. I have created twenty-eight new letters so that all people may easily learn them and use them in their daily lives."
A king built an alphabet so commoners could write because the existing system was unfair.
Hangul's consonant shapes aren't arbitrary. They diagram what your mouth does when you make the sound.
Related sounds are built by adding strokes to a base shape. ㄱ (g) gets a stroke to become ㅋ (k, aspirated). ㄴ (n) gets a stroke to become ㄷ (d). The system is a phonological diagram you carry in your pocket.
Vowels follow a different logic. They're built from three philosophical elements: a dot (heaven), a horizontal line (earth), and a vertical line (humanity). ㅏ (a), ㅓ (eo), ㅗ (o), ㅜ (u) are all combinations of these three, with position indicating the vowel quality. In modern fonts the dot has flattened into a short stroke, but the underlying logic is unchanged.
Hangul's other innovation is the syllable block. Individual letters don't sit in a line like English. They stack into blocks that represent syllables:
This makes Hangul simultaneously alphabetic (individual sounds have individual letters) and syllabic (visual blocks represent syllable chunks). Korean text has the visual density of Chinese characters with the learnability of an alphabet.
Linguists have a term for this kind of script: a featural writing system. The letter shapes encode features of the sound itself, especially what your mouth is doing. Most alphabets aren't like that. There's no reason "B" should represent that sound; the shape and the sound are arbitrarily linked. Hangul's letters tell you, visually, what to do with your tongue and lips. Geoffrey Sampson, who coined the classification, treats Hangul as its most famous member, alongside niche cases like Pitman shorthand and Alexander Melville Bell's Visible Speech.
The practical result: a motivated learner can learn to read Korean in a few hours. Not fluently. You'll be slow, and you won't understand the words yet. But you can sound out any Korean text after an afternoon of study. Try that with Chinese characters or Japanese kanji.
UNESCO named its literacy prize the King Sejong Literacy Prize. It's hard to think of a higher honor for a writing system, or a better summary of what Sejong set out to do: make reading accessible to everyone.
Hangul wasn't immediately embraced. The Joseon-era scholarly class, who had invested years in mastering Classical Chinese, resisted it. Choe Manri, a senior advisor, submitted a famous petition arguing that adopting a simplified script would make Korea look barbaric to China. His argument: literacy should be hard because difficulty signals sophistication.
Sejong ignored him. Hangul gradually spread among women, commoners, and later, anyone who wanted to write in their own language rather than someone else's.
It took centuries to fully displace Chinese characters in Korean writing. But Sejong was right. The most logical alphabet ever created eventually won because it did exactly what he designed it to do: let anyone read.