How Hangul Works

Hangul (한글) is the Korean writing system, and it is widely considered one of the most scientifically designed alphabets in the world. Unlike writing systems that evolved organically over millennia, Hangul was deliberately created by a single team under the direction of King Sejong the Great in 1443.

The Story of King Sejong

Before Hangul, Korea used Classical Chinese characters (Hanja, 漢字) for writing. This created enormous problems:

Chinese characters are extremely difficult to learn — thousands must be memorised
Only the aristocratic yangban class had the education to read and write
The vast majority of Koreans were illiterate
Chinese characters were designed for Chinese, not Korean — the grammar and sounds don't align well

King Sejong (세종대왕), the fourth king of the Joseon dynasty, was deeply troubled by this. He believed that every person, regardless of social class, should be able to read and write.

"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." — Hunminjeongeum Haerye (1446)

In 1443, King Sejong and a team of scholars at the Hall of Worthies (집현전, Jiphyeonjeon) completed the new alphabet. It was officially published in 1446 in a document called the Hunminjeongeum (훈민정음), meaning "The Correct Sounds for the Instruction of the People."

Design Principles

Hangul was not invented randomly. Its design follows scientific principles:

1. Consonants Mirror the Mouth

The shapes of consonant letters are based on the position and shape of the speech organs when producing the sound:

Organ	Letter	Sound	How It Maps
Velar (back of tongue)	ㄱ	g/k	Shape of the tongue touching the soft palate
Alveolar (tongue tip)	ㄴ	n	Shape of the tongue touching the upper gum ridge
Bilabial (lips)	ㅁ	m	Shape of the mouth (square = closed lips)
Dental (teeth)	ㅅ	s	Shape of the teeth
Glottal (throat)	ㅇ	ng/silent	Shape of the open throat

2. Vowels Are Based on Philosophy

Vowels are constructed from three fundamental elements drawn from Neo-Confucian cosmology:

Element	Shape	Represents
Dot (now a short stroke)	ㆍ	Heaven (天) — the round sky
Horizontal line	ㅡ	Earth (地) — the flat ground
Vertical line	ㅣ	Human (人) — a standing person

All vowels are combinations of these three elements.

3. Stronger Sounds Add Strokes

To make a consonant sound stronger (aspirated or tense), you add strokes to the base letter:

Base	Aspirated	Tense
ㄱ (g)	ㅋ (k)	ㄲ (gg)
ㄷ (d)	ㅌ (t)	ㄸ (dd)
ㅂ (b)	ㅍ (p)	ㅃ (bb)
ㅈ (j)	ㅊ (ch)	ㅉ (jj)
ㅅ (s)	—	ㅆ (ss)

This means that letters with related sounds also look related — a brilliant design feature.

Jamo: The Building Blocks

The individual letters of Hangul are called jamo (자모). There are:

Type	Count	Examples
Basic consonants	14	ㄱ ㄴ ㄷ ㄹ ㅁ ㅂ ㅅ ㅇ ㅈ ㅊ ㅋ ㅌ ㅍ ㅎ
Basic vowels	10	ㅏ ㅑ ㅓ ㅕ ㅗ ㅛ ㅜ ㅠ ㅡ ㅣ
Double consonants	5	ㄲ ㄸ ㅃ ㅆ ㅉ
Compound vowels	11	ㅐ ㅔ ㅘ ㅙ ㅚ ㅝ ㅞ ㅟ ㅢ ㅒ ㅖ

In total, there are 40 jamo (though the 24 basic ones — 14 consonants + 10 vowels — are the core set).

Syllable Blocks

Unlike English, where letters are written in a straight line, Hangul letters are grouped into syllable blocks. Each block represents one syllable and contains:

An initial consonant (초성, choseong)
A vowel (중성, jungseong)
An optional final consonant (종성, jongseong) — also called batchim (받침)

Block Structure Examples

CV Block (no final consonant):
┌───┬───┐
│ C │ V │    Example: 가 = ㄱ + ㅏ = "ga"
└───┴───┘

CV Block (vertical vowel):
┌───┐
│ C │
├───┤    Example: 고 = ㄱ + ㅗ = "go"
│ V │
└───┘

CVC Block:
┌───┬───┐
│ C │ V │    Example: 한 = ㅎ + ㅏ + ㄴ = "han"
├───┴───┤
│   C   │
└───────┘

The word 한글 (Hangul) itself is two syllable blocks:

한 = ㅎ (h) + ㅏ (a) + ㄴ (n) → "han"
글 = ㄱ (g) + ㅡ (eu) + ㄹ (l) → "geul"

Why Hangul is Special

Feature	Hangul	Most Other Scripts
Designed scientifically	Yes — shapes reflect speech organs	No — evolved organically
Learnable in hours/days	Yes	Often takes months or years
Systematic sound relationships	Related sounds have related shapes	No systematic pattern
Efficient for digital typing	Extremely efficient	Varies widely
UNESCO recognition	Hunminjeongeum is a Memory of the World	—

Hangul is celebrated every year on October 9th in South Korea as Hangul Day (한글날).

Summary

Hangul was created in 1443 by King Sejong the Great to give all Koreans — not just the elite — the ability to read and write. Its consonant shapes are based on the speech organs, its vowels on cosmological principles, and related sounds share visual similarities. Letters are assembled into syllable blocks (initial consonant + vowel + optional final consonant). In the next lesson, we will learn the nine basic consonants.