Nobody can tell you who invented the ABCs. The Latin alphabet grew out of older scripts over many centuries, and no one signed it, dated it or wrote a preface explaining what it was for. Korea's alphabet has an author, a publication date down to the month, and a surviving book that explains how the letters were built.
That book is the Hunminjeongeum, announced in 1446, and 2026 is its 580th anniversary. South Korea marks it every year on October 9 as Hangeul Day, which lands on a Friday this time. The observance itself is also turning 100, a coincidence that has turned this year's celebration into a big one.
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| Hangeul turns 580 this year, and the carved letters of its first printing blocks still show how deliberate the design was. |
This guide covers where the date comes from, the holiday's odd history and what is happening in Seoul during the week around it.
What Hangeul Day Is (Quick Guide)
Hangeul Day is South Korea's public holiday for the Korean alphabet, held on October 9. It celebrates the day Koreans chose to remember King Sejong's announcement of the script in 1446, and in 2026 it falls on a Friday, so many people get a three-day weekend.
The anniversary number is where the 2026 excitement comes from. According to South Korea's National Hangeul Museum, this year is the 580th anniversary of the promulgation of the Hunminjeongeum, the 100th anniversary of the founding of Hangeul Day, and the 100th anniversary of Hunmaengjeongeum, the Korean Braille system. The museum has named 2026 the "Year of Hangeul" and spread its program across the calendar, with exhibitions running from May through November.
Spelling trips people up. Hangeul is the South Korean romanization of the alphabet's name, and many English sources use Hangul instead. Both refer to the same script, so Hangeul Day and Hangul Day are the same holiday.
Why It Is October 9
The date is a calendar conversion. The Hunminjeongeum was officially published in the ninth month of 1446 on the old lunar calendar, and the postface of the commentary edition is dated to the first ten days of that month. After liberation in 1945, authorities picked the tenth day of the ninth month, the last of those first ten days, and that day was October 9 on the Gregorian calendar.
So October 9 is a reasoned estimate of the date. The Veritable Records say only that the work was published at some point during that month, and the exact date remains uncertain. That is an honest quirk, and it makes the holiday a little more interesting than a date nobody could question.
The evidence for any of this survived by luck. The commentary edition, the Hunminjeongeum Haerye, was once believed lost, and a copy was found in 1940 in an old house in Andong, in North Gyeongsang Province. It was inscribed in UNESCO's Memory of the World Register in 1997 and is designated National Treasure No. 70 in Korea.
There is a footnote for readers who follow both Koreas. North Korea celebrates its own day on January 15, apparently tied to the 1443 announcement of the script, though the reasoning behind it is not well documented.
What King Sejong Said He Wanted (Quick Guide)
Sejong wrote the preface himself, and it reads like a mission statement. In it he says he was distressed that ordinary people could not express themselves in writing, and that he had newly designed twenty-eight letters, which he wished everyone to practice at their ease and make convenient for their daily use.
The writing system in use at the time was built on Chinese characters, which take years of schooling to learn. A 28-letter script that could be picked up quickly changed who could read and write. Wikipedia notes that within a decade of liberation in 1945, a significant majority of Koreans in both Koreas became literate in at least Hangul.
The commentary was a team effort. Sejong wrote the preface, and scholars of the Hall of Worthies supplied more detailed explanations and examples in the commentary section, called the haerye. The alphabet came with its own instruction manual.
The Alphabet at a Glance (Quick Guide)
Hangeul today has 24 basic letters, 14 consonants and 10 vowels, down from the 28 Sejong designed. Modern orthography counts 51 jamo in all once the basic letters are combined, jamo being the individual letter shapes.
The letters stack into syllable blocks. Each block holds an initial consonant, a vowel and sometimes a final consonant, so a word looks like a row of small squares and not a line of letters running side by side. The principle is called moasseugi, which means gathering together and writing.
The design logic is spelled out in the haerye. The commentary describes five basic consonants as drawings of speech organs: ㄱ depicts the tongue blocking the palate, ㄴ the tongue touching the palate, ㅁ the mouth, ㅅ a tooth and ㅇ the throat.
For a North American reader, the closest comparison is the difference between a typeface and a blueprint. The Latin alphabet is the product of centuries of drift, with letter shapes that nobody can fully explain. Hangeul is a script that was planned on paper first, and the shapes carry a reason you can read about in a book that still exists.
A Holiday That Disappeared and Came Back
Hangeul Day has not always been a day off. According to Wikipedia, South Korea made it a public holiday in 1949, then demoted it to a commemoration without time off in 1990 to reduce the number of rest days. A presidential order in December 2012 restored it as a public holiday.
The stated reason for the 1990 change was the number of rest days on the calendar, so the day lost its time off for scheduling reasons.
If you are used to American federal holidays, the closest comparison is a holiday for the alphabet itself. Imagine a Monday off to honor the ABCs, with a museum exhibition and a concert in front of the Lincoln Memorial. It sounds like a joke in English, and in Seoul it is simply a Friday in October.
Hangeul Week 2026 (Quick Guide)
The government is running a "Hangeul Week" from October 6 to 17, built around the theme "Hangeul beside me" (my translation of the Korean title, Nae Gyeote Hangeul). The ministry says it is marking the 580th anniversary of the Hunminjeongeum and the 100th anniversary of the founding of Hangeul Day, and events are planned across the country. The lineup below comes from Korean press coverage published in the last few days.
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| Gwanghwamun Square is the main stage for Hangeul Week, which runs October 6 to 17. |
The main stage is Gwanghwamun Square in central Seoul, the plaza where the statue of King Sejong sits. A festival called Hangeul Madang runs there from October 6 to 8, with musicals, performances, a children's Hangeul playground, an exhibition of decorative lettering and more than 20 programs in all.
On the evening of October 8 at 7 p.m., a pre-holiday celebration opens with the lighting of 100 lights on the square to mark the 100th anniversary. A K-pop group and an indie band perform, and foreign students and citizens take part in a reading stage.
The visual centerpiece is a media facade called "Twenty-Four, Universe," projected on the outer wall of Gwanghwamun from October 8 to 11, from 8 p.m. to 11 p.m. each night. It shows Hangeul consonants and vowels turning into constellations, nature and living things. The title likely refers to the 24 basic letters in use today, though the press coverage does not say so directly.
Other programs are more specialized. A Hangeul culture industry fair for cultural products runs October 6 to 8, and an academic conference on the future of the Korean language takes place on October 12 at the National Museum of Korea. The National Hangeul Museum is holding a special exhibition called "Gagya" for the 100th anniversary, and Sejong City hosts its own Sejong Hangeul Festival.
Schedules like these can shift, and details on venues for the exhibition and the festival were not clear in the coverage. Check the National Hangeul Museum and the Ministry of Culture, Sports and Tourism before you plan a trip around any single event.
Spending the Day Itself
On October 9 itself, the best fit for a visitor is the evening. The big stage programs at Gwanghwamun are scheduled for the days before, and the media facade is still running on Friday night, so the plaza is the natural place to be after dark.
Korean news coverage of last year's holiday described crowds of families out for the day, which fits a holiday that falls next to a weekend.
A quieter option is the National Hangeul Museum's special exhibition. Confirm the venue and opening hours first, because holiday schedules differ from ordinary weekdays and the coverage I found did not list them.
You do not need to read Korean to enjoy any of it. The light show and the lettering exhibition work as visual art, and the letters on display make better sense once you know the story behind them.
Try Five Letters Before Friday
You can read your first Hangeul in a few minutes, and the five consonants from the haerye are the place to start. ㄱ is a hard g or k sound, ㄴ is n, ㅁ is m, ㅅ is s and ㅇ is silent at the start of a syllable, which is why it shows up in front of a vowel.
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| Five basic consonants are enough to start reading your first syllables. |
Add two vowels, ㅏ as in "father" and ㅣ as in "see," and you can already assemble syllables: ㄱ with ㅏ makes 가 (ga), ㅁ with ㅏ makes 마 (ma) and ㄴ with ㅣ makes 니 (ni). The blocks follow the stacking rule, with the consonant on the left or top and the vowel beside or below it.
Sejong wanted a script that anyone could practice at their ease, and five letters in, you are already using it the way he intended. On October 9 you can try the rest while the square outside is full of people celebrating the same idea.
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