Why is the Hangul alphabet so special? Discover why King Sejong created it, how science and philosophy shaped its letters, and why it remains meaningful in modern Korea.
In the heart of Seoul’s Gwanghwamun Square stands an enormous statue of King Sejong the Great, with Gyeongbokgung Palace in the background. If you ever visit Seoul, there’s a good chance you’ll come across it. But did you know that this king created the writing system Koreans still use every day, nearly 600 years ago?
The Hangul alphabet is more than a way to write Korean. Its letters reflect how humans produce sounds, and an extraordinary historical document explains the principles behind their design.
To understand what makes Hangul special, we need to look at the king who created it, the philosophy behind its letters, and the surprising ways it remains part of Korean life today.
Why Did King Sejong Create the Hangul Alphabet?
Before Hangul existed, Koreans already spoke Korean. However, written communication relied heavily on Chinese characters, including systems that adapted those characters to represent Korean.
For ordinary people with limited access to education, learning to read and write was difficult.
King Sejong, the fourth ruler of the Joseon Dynasty (1392–1897), recognized this problem.
In 1434, he commissioned the publication of Samgang Haengsildo, an illustrated book about exemplary loyalty, filial devotion, and marital virtue. It presented stories of loyal subjects, devoted children, and virtuous women through pictures and Classical Chinese text.
But there was a fundamental problem: how could people who were busy earning a living and had never studied Chinese characters fully understand these lessons?
The book illustrates the kind of challenge Sejong hoped to overcome. Historical records also show that he later discussed making its teachings accessible through the new writing system, although the book cannot be established as the single direct cause of Hangul’s invention.
In 1443, Sejong personally created a new writing system called Hunminjeongeum, meaning “the correct sounds for the instruction of the people.” It was formally introduced with an explanatory text in 1446.
That writing system eventually became known as Hangul.
Sejong explained that people struggled to express themselves in writing because their language differed from Chinese. His goal was to give them a more accessible way to communicate.
Not everyone welcomed the idea.
In 1444, Choe Man-ri, a senior scholar at the royal research institution known as Jiphyeonjeon (Hall of Worthies), joined other officials in submitting a petition against the new alphabet.
Their objections included concerns about established scholarly traditions, the use of Chinese writing, and Joseon’s relationship with China. The controversy also reflected a society in which mastery of Classical Chinese was closely connected to education and official status.
However, it would be misleading to say Hangul was banned throughout the Joseon Dynasty.
Although Classical Chinese remained influential in government, Hangul gradually spread through royal correspondence, personal letters, literature, and everyday written communication.
How Science and Philosophy Shaped Hangul’s Letters
One remarkable feature of Hangul is that its letters were deliberately designed around the sounds they represent.
Take the consonants, for example.
The letter ㅁ reflects the shape of closed lips, while ㄴ represents the position of the tongue touching the ridge behind the upper teeth. The letter ㄱ depicts the back of the tongue raised toward the throat.
Related consonants were created by adding strokes to basic shapes.
Look at ㄴ → ㄷ → ㅌ. These letters share a visual relationship that reflects a systematic approach to representing speech sounds.
The vowels follow a different principle.
The three original basic vowel symbols were:
- ㆍ — Heaven
- ㅡ — Earth
- ㅣ — Human beings
These symbols were combined to create additional vowels.
Their design reflects traditional East Asian philosophical ideas, including eum-yang (yin and yang) and the Five Elements, which were used to explain relationships and patterns in the natural world.
Hangul therefore brings together two fascinating ideas: an analysis of human speech and a philosophical understanding of the universe.
Much of what we know about these principles comes from the Hunminjeongeum Haerye, an explanatory volume published in 1446.
An important surviving copy was discovered in Andong, North Gyeongsang Province, in 1940. It explains how the letters were designed and used, offering direct historical evidence of the writing system’s original principles.
That is one of Hangul’s most distinctive qualities. Its creation was not only intentional; the reasoning behind its design was also documented.
Why Is Hangul Still Special Nearly 600 Years Later?
Hangul has a surprisingly personal meaning in my family.
My father told me that when he chose my name, he consulted a book about Hunminjeongeum seongmyeonghak, a Korean naming practice that interprets the sounds and structures of letters through traditional philosophical principles.
He considered the sounds and composition of the characters used in my name and even checked his final choice with the book’s author.
This doesn’t mean the naming method is scientifically proven. What I find interesting is how ideas associated with Hangul and traditional eum-yang philosophy can still influence something as personal as choosing a child’s name.
Hangul’s systematic design is also visible in ordinary Korean life.
For example, combine ㅂ and ㅏ, and you get 바 (ba).
Now add ㄴ + ㅏ to form 나 (na).
Put the syllables together, and you get 바나나 (banana), the Korean word for banana.
For someone encountering Hangul for the first time, Korean syllable blocks may look like complicated individual symbols. But once you understand how consonants and vowels fit together, the structure becomes much clearer.
Of course, learning to read Hangul is not the same as mastering Korean grammar, vocabulary, and pronunciation. The language itself can still be challenging.
I also notice Hangul’s structure whenever I type messages on my phone or use a computer keyboard. Individual consonants and vowels are combined automatically into complete syllable blocks.
Modern input software makes this possible, but Hangul’s systematic structure is particularly well suited to it.
Sometimes I jokingly wonder whether King Sejong somehow anticipated the age of smartphones. Obviously, he couldn’t have. Still, it is remarkable that a writing system designed nearly six centuries ago works so naturally with today’s technology.
Hangul’s original commitment to accessible literacy also continues to be recognized internationally.
In 1989, UNESCO established the King Sejong Literacy Prize with support from the South Korean government. The prize honors outstanding literacy education initiatives, with particular attention to learning through people’s mother languages.
Closing Thoughts
Hangul is Korea’s writing system, but the ideas behind its creation reach beyond Korea.
King Sejong wanted more people to have the ability to express themselves through writing, rather than leaving literacy primarily to those with access to advanced education.
The statue in Gwanghwamun Square, the centuries-old Hunminjeongeum Haerye, and the Korean letters appearing on my smartphone screen might seem like parts of completely different worlds.
Yet they are connected by the same writing system.
Perhaps what makes Hangul most special isn’t simply how quickly someone can learn its letters. It’s that the principles behind a writing system created nearly 600 years ago remain visible in the way Koreans read, write, communicate, and even choose names today.