Week 1
1443: A King Designs an Alphabet
The Logic and Structure of Hangul — Reading Sejong's Blueprint
WEEK 1
1443: A King Designs an Alphabet
Your First Look at Hangul
When you first encountered Hangul, this was probably what caught your eye:
안녕하세요.
And your reaction was probably something like:
"...What are these boxy blobs? Are those letters? Where on earth are the consonants and vowels? How am I supposed to pronounce any of this? This looks impossibly complicated!"
Don't worry. Everyone thinks exactly that on first contact. Hangul looks like nothing else in the world — because it is like nothing else in the world.
Hangul is the only writing system in history where both the date of creation and the name of its creator are documented.
Isn't that wild? A script that was invented — by a single person — and is still in widespread use today.
So who invented it?
King Sejong the Great.
What It Means to Invent a Writing System
Most writing systems come into existence like this:
Someone draws a rough picture → It gets squashed over thousands of years → A letter emerges
Take the letter A in the English alphabet — it was originally a bull's head. 𓃾 That image spent about 3,000 years toppling sideways until it became A. No Egyptian, Phoenician, or Greek sat down and said "let's turn this into a letter." It just... happened.
That's true of most scripts in the world. Mesopotamian cuneiform, Chinese characters, Arabic script — all of them are the product of thousands of years of collective, unplanned evolution.
Hangul is completely different.
The Problem Sejong Faced
In 1443, Sejong, the fourth king of the Joseon Dynasty, was staring at a serious problem.
At the time, the only official writing system in East Asia was Hanja (Chinese characters). Hanja are pictographic and ideographic — each character was shaped after a real object and carried one or two meanings. Because of this, the system required tens of thousands of characters, and mastering it took years. The only people who had the time and resources to learn it were the nobility and government officials.
Ordinary people who couldn't read had no access to the law, no way to assert their rights, and no means to put their grievances into writing. Here's what Sejong himself wrote in the preface to Hunminjeongeum:
"The language of our country differs from that of China and does not suit Chinese characters. Therefore, among the foolish common people, there are many who, even if they have something to say, are unable in the end to express their feelings." — Preface to Hunminjeongeum (1446)
Sejong's solution was radical: design an entirely new writing system from scratch.
A Secret Project, and Fierce Opposition
Sejong carried out this work with a small group of scholars at the royal research institute, Jiphyeonjeon (集賢殿). It was kept under wraps for good reason — senior officials were strongly opposed.
Choe Manri, Deputy Director of the Jiphyeonjeon, submitted a formal protest:
"We should be learning from China. Why would we create a separate script?"
Sejong ignored him and kept going.
Creation (1443) and Proclamation (1446)
After three years of work, the writing system was completed in 1443. This is 창제 (創製) — the year it was created.
Three years later, in 1446, Sejong released the script to the world along with a detailed explanatory document. This is 반포 (頒布) — the year it was proclaimed.
That document is the Hunminjeongeum Haerye (訓民正音 解例本). It's not just a user manual. It records, in meticulous detail, why each letter has the shape it does and the principles behind the entire design. Thanks to it, we can still know Sejong's exact design intentions 580 years later.
"The correct sounds for instructing the people" — Hunminjeongeum [hun.min.dʑʌŋ.ɯm]
The original script had 28 letters. Four have fallen out of use, leaving the 24 (14 consonants + 10 vowels) used today.
A king personally inventing a writing system is unique in all of world history.
And there's more. Hangul is remarkably easy to learn.
"A wise person can understand it before the morning is over; even a fool can learn it in ten days."
Separate from the Korean language itself, the Hangul script is genuinely not hard to pick up.
Why This Is Such a Big Deal
| 한자 (Hanja) | 한글 (Hangeul) | |
|---|---|---|
| Number of characters | 50,000+ | 24 (14 consonants + 10 vowels) |
| Time to learn | Several years | A few days |
| Who made it | Thousands of years of evolution | Designed by one person |
| Design logic | Has internal logic (radicals, etc.) but mostly memorization | Modeled directly on the shape of speech organs |
The Heart of Hangul: A Three-Story Block
Now let's look at the most important principle of all.
Why does Hangul look like little square blocks?
English works like this:
C + A + T = CAT
(letters line up side by side — Linear)
Hangul works like this:
ㄱ + ㅏ + ㅁ = 감 [gam]
(letters are assembled inside a square — Syllabic Block)
This is called 모아쓰기 (block assembly). And inside each square, there are three slots:
┌──────────────────┐
Top │ 초성 (First sound) │ ← a consonant goes here (Initial consonant)
├──────────────────┤
Middle │ 중성 (Middle sound) │ ← a vowel goes here (Medial vowel)
├──────────────────┤
Bottom │ 종성 (Final sound) │ ← a consonant goes here, optional (Final consonant)
└──────────────────┘
One character = one square = one syllable (one chunk of sound).
How the consonant and vowel are arranged inside the square depends on the shape of the vowel:
[Vertical vowels] — vowel attaches to the RIGHT of the consonant (e.g.: 가, 너, 미)
┌──────┬────┐
│ 초성 │ 중 │
│ (ㄱ) │ 성 │
│ │(ㅏ)│
└──────┴────┘
가 [ga]
[Horizontal vowels] — vowel attaches BELOW the consonant (e.g.: 고, 누, 그)
┌──────────┐
│ 초성 (ㄱ) │
├──────────┤
│ 중성 (ㅗ) │
└──────────┘
고 [go]
This is the defining difference between English (linear writing) and Hangul (block assembly).
English (linear): g a m → each letter lines up side by side
Hangul (block): ㄱ+ㅏ+ㅁ → combined into a single square block → 감
✏️ Activity 1: Linear → Block
Below, consonants and vowels are shown separately in linear form. What character do they form when assembled into a single square block? Write the completed character in the blank.
Linear form Block form
──────────────────────────
ㄴ + ㅏ → ___ [na]
ㅁ + ㅏ → ___ [ma]
ㄱ + ㅗ → ___ [go]
ㄴ + ㅜ → ___ [nu]
ㅂ + ㅓ → ___ [beo]
ㄱ + ㅏ + ㅁ → ___ [gam]
ㄴ + ㅏ + ㄴ → ___ [nan]
(Hint: vertical vowels ㅏ, ㅓ go to the right of the consonant; horizontal vowels ㅗ, ㅜ go below.)
What Goes in Each Slot
The rules are simple:
Initial consonant slot → consonants only
| Consonant | Romanization | IPA |
|---|---|---|
| ㄱ | g/k | [k/g] |
| ㄴ | n | [n] |
| ㄷ | d/t | [t/d] |
| ㄹ | r/l | [ɾ/l] |
| ㅁ | m | [m] |
| ㅂ | b/p | [p/b] |
| ㅅ | s | [s] |
| ㅇ | silent/ng | [∅/ŋ] |
| ㅈ | j | [tɕ] |
| ㅊ | ch | [tɕʰ] |
| ㅋ | k | [kʰ] |
| ㅌ | t | [tʰ] |
| ㅍ | p | [pʰ] |
| ㅎ | h | [h] |
Medial vowel slot → vowels only
| Vowel | Romanization | IPA |
|---|---|---|
| ㅏ | a | [a] |
| ㅑ | ya | [ja] |
| ㅓ | eo | [ʌ] |
| ㅕ | yeo | [jʌ] |
| ㅗ | o | [o] |
| ㅛ | yo | [jo] |
| ㅜ | u | [u] |
| ㅠ | yu | [ju] |
| ㅡ | eu | [ɯ] |
| ㅣ | i | [i] |
Final consonant slot → consonants only (받침 batchim — optional, can be left empty)
Consonants and vowels look completely different from each other. This is not an accident.
| Consonants (자음) | Vowels (모음) |
|---|---|
| ㄱ [g/k] — angular shape | ㅏ [a] — vertical line + dot |
| ㄴ [n] — right angle | ㅓ [eo] — dot + vertical line |
| ㅁ [m] — square | ㅗ [o] — dot + horizontal line |
| ㅇ [silent/ng] — circle | ㅜ [u] — horizontal line + dot |
You can tell them apart at a glance: consonants are angular and complex; vowels are simple lines and dots. Why? We'll get to that in a moment.
Dissecting Real Words: Hangul X-Ray
Let's break down some actual words into their 초성·중성·종성 components.
Example ① No final consonant: "나비" — nabi [na.bi] (butterfly)
나 = ㄴ(n) + ㅏ(a)
비 = ㅂ(b) + ㅣ(i)
No 종성. A clean two-piece assembly.
Example ② With a final consonant: "한글" — hangeul [han.ɡɯl] (Hangul)
한 = ㅎ(h) + ㅏ(a) + ㄴ(n)
글 = ㄱ(g) + ㅡ(eu) + ㄹ(l)
The full three-piece package.
Example ③ Diphthong: "왜" — wae [wɛ] (why)
왜 = ㅇ(silent) + ㅙ(wae)
Here, ㅙ is a diphthong made up of ㅗ + ㅏ + ㅣ combined. The medial slot can hold two or more vowels combined together.
Example ④ Silent initial consonant: "우유" — uyu [u.ju] (milk)
우 = ㅇ(silent) + ㅜ(u)
유 = ㅇ(silent) + ㅠ(yu)
When ㅇ appears in the initial consonant slot, it makes no sound — it's a placeholder. Something has to fill that slot to complete the square.
Example ⑤ Double final consonant: "닭" — dak [tak̚] (chicken)
닭 = ㄷ(d) + ㅏ(a) + ㄺ(double final consonant)
The final consonant slot can hold two consonants. This is called 겹받침 (a double batchim). The actual pronunciation is [닥]. (We'll cover this in detail in Week 5.)
✏️ Activity 2: Spot the Consonants and Vowels
Look at the words below, break them into 초성·중성·종성, and label each piece as a consonant or vowel.
┌──────────────────────────────────────────────────────┐
│ │
│ ① "사람" — saram [sa.ɾam] (person) │
│ 사 = ___ (초성) + ___ (중성) + ___ (종성) │
│ 람 = ___ (초성) + ___ (중성) + ___ (종성) │
│ │
│ ② "소" — so [so] (cow) │
│ 소 = ___ (초성) + ___ (중성) │
│ → Final consonant: ( present / absent ) │
│ │
│ ③ "산" — san [san] (mountain) │
│ 산 = ___ (초성) + ___ (중성) + ___ (종성) │
│ Which consonant is in the final slot? ____ │
│ │
│ ④ "이유" — iyu [i.ju] (reason) │
│ 이 = ___ (초성) + ___ (중성) │
│ 유 = ___ (초성) + ___ (중성) │
│ The ㅇ in the initial slot: ( makes a sound / silent ) │
│ │
│ ⑤ Sort the following into consonants and vowels: │
│ ㄱ ㅏ ㅁ ㅓ ㅅ ㅗ ㄴ ㅣ │
│ │
│ Consonants: _____________ │
│ Vowels: _____________ │
│ │
└──────────────────────────────────────────────────────┘
(Hint: consonants are angular; vowels are made of straight lines and dots.)
Where Did These Shapes Come From: Sejong's Blueprint
Here's why consonants and vowels look so different from each other. Time to look at Sejong's design document.
Consonants: Modeled on the Shape of Speech Organs
When designing consonants, Sejong literally drew pictures of what the tongue and mouth do when producing each sound. No other writing system in the world has ever done this.
From the 14 consonants we saw earlier, here are the key 5 — and why each one looks the way it does:
| Consonant | Romanization | IPA | Shape of the speech organ |
|---|---|---|---|
| ㄱ | g/k | [k/g] | The root of the tongue blocking the throat (the tongue bends like the letter ㄱ) |
| ㄴ | n | [n] | The tip of the tongue touching the upper gum |
| ㅁ | m | [m] | The square shape of closed lips |
| ㅅ | s | [s] | Air escaping between the teeth |
| ㅇ | (silent/ng) | [∅/ŋ] | The round shape of the throat |
Vowels: Modeled on Heaven, Earth, and Humanity
| Vowel | Romanization | IPA | Symbol |
|---|---|---|---|
| ㆍ | — | [ʌ] | The round shape of Heaven (天) — not used in modern Korean |
| ㅡ | eu | [ɯ] | The flat shape of Earth (地) |
| ㅣ | i | [i] | A Person (人) standing upright |
These three basic shapes are combined to build every single vowel:
ㅏ = ㅣ + ㆍ (Person + Heaven → dot on the right) [a]
ㅓ = ㆍ + ㅣ (Heaven + Person → dot on the left) [ʌ]
ㅗ = ㆍ + ㅡ (Heaven + Earth → dot above) [o]
ㅜ = ㅡ + ㆍ (Earth + Heaven → dot below) [u]
This is called the 천지인 (天地人) principle — Heaven, Earth, and Humanity. The entire vowel system, designed from just three shapes.
Have you ever seen a Korean tapping at their phone on a keyboard with dots and lines?
That's the Cheonjiin keyboard — different from the QWERTY layout, it reflects the very design principles used to create Hangul. Sejong's creative logic is still woven into the everyday lives of Koreans today.
✏️ Activity 3: Finding Vowel Position
Hangul vowels sit either to the right or below the consonant, depending on their shape.
| Vowel type | Placement rule | Examples |
|---|---|---|
| Vertical vowels (ㅏ a, ㅓ eo, ㅣ i, ㅑ ya, ㅕ yeo) | Right of the consonant | 가 [ga], 너 [neo], 미 [mi] |
| Horizontal vowels (ㅗ o, ㅜ u, ㅡ eu, ㅛ yo, ㅠ yu) | Below the consonant | 고 [go], 누 [nu], 그 [geu] |
Practice: In the words below, circle only the vowels (ㅏ, ㅣ, ㅜ, ㅠ, etc.).
1. 피자 (pizza): 피 [pi] 자 [ja]
2. 우유 (milk): 우 [u] 유 [yu]
3. 나무 (tree): 나 [na] 무 [mu]
4. 오이 (cucumber): 오 [o] 이 [i]
✏️ Activity 4: Batchim — Two-Story vs. Three-Story Buildings
When a 받침 (종성, batchim) is added at the bottom of a Hangul character, the building gains an extra floor. With batchim, the character's center of gravity shifts downward (↓).
- 2-story building (no batchim): Initial consonant + Medial vowel
- 3-story building (with batchim): Initial consonant + Medial vowel + Final consonant (batchim)
Identify how many stories each word below has. Feel free to color-code each floor a different color.
┌──────┬────────────────────┬──────────────────────────┐
│ Word │ 2-story (no batchim)│ 3-story (with batchim) │
├──────┼────────────────────┼──────────────────────────┤
│ 가/강 │ Floor 1: 초성 │ Floor 1: 초성 │
│ga/gang│ Floor 2: 중성 │ Floor 2: 중성 │
│ │ │ Floor 3: 종성 ↓ │
├──────┼────────────────────┼──────────────────────────┤
│ 나/난 │ ___-story │ ___-story │
│na/nan │ │ │
├──────┼────────────────────┼──────────────────────────┤
│ 소/손 │ ___-story │ ___-story │
│so/son │ │ │
├──────┼────────────────────┼──────────────────────────┤
│ 배/밤 │ ___-story │ ___-story │
│bae/bam│ │ │
└──────┴────────────────────┴──────────────────────────┘
✏️ Activity 5: Color Traffic Light — Sorting 초성·중성·종성
Color-coding each part of a character makes Hangul's logical structure pop right off the page.
Color guide:
🔵 초성 (initial consonant) = blue
🔴 중성 (medial vowel) = red
🟢 종성 (final consonant/batchim) = green
Example: 라디오 — radio [ɾa.di.o]
라 = ㄹ(blue) + ㅏ(red)
디 = ㄷ(blue) + ㅣ(red)
오 = ㅇ(blue) + ㅗ(red)
Practice: Analyze the words below using the color traffic light system.
1. 바나나 — banana [ba.na.na]
바 = ㅂ( ) + ㅏ( )
나 = ㄴ( ) + ㅏ( )
나 = ㄴ( ) + ㅏ( )
2. 레몬 — remon [ɾe.mon] (has a batchim 'ㄴ'!)
레 = ㄹ( ) + ㅔ( )
몬 = ㅁ( ) + ㅗ( ) + ㄴ( ) ← What color is that last slot? ( )
A Design Recognized by the World
In 1997, UNESCO inscribed Hunminjeongeum on the Memory of the World Register.
That same year, UNESCO also established the UNESCO King Sejong Literacy Prize, awarded annually to individuals or organizations that have made outstanding contributions to combating illiteracy worldwide.
What linguists have said:
"The most scientific writing system in the world." — Geoffrey Sampson, Writing Systems (1985)
"Hangul is a script that perfectly visualizes phonetic principles." — UNESCO Memory of the World evaluation
A script designed by a king 580 years ago is still drawing admiration from linguists today.
Today's Practice: Your First Hangul Character
You don't need to memorize anything yet. Today, let's just write one character by hand.
'가' — ga [ka]
ㄱ — 2 strokes:
① → Horizontal stroke: draw from left to right
② ↓ Vertical stroke: from the right end of ①, draw downward
Result: a right-angle shape — like the top-right corner of a box
(draw ① across → bend at the end → bring ② down)
ㅏ — 2 strokes:
① ↓ Vertical stroke: draw straight downward from top to bottom
② → Horizontal stroke: from the midpoint of ①, draw a short line to the right
Result: a vertical line with a short branch sticking out from the middle on the right
(like a tiny tree branch — ① vertical first, then ② branch to the right from the middle)
Put them together — ㄱ goes on the left, ㅏ attaches to the right of ㄱ:
┌────┬──┐
│ ㄱ │ㅏ│ → 가 [ga/ka]
└────┴──┘
Now it's your turn:
┌─────────────────────────────────────────┐
│ │
│ │
│ │
│ │
│ │
│ │
│ │
├─────────────────────────────────────────┤
│ ✏️ Write '가' here. │
│ ㄱ(g/k) + ㅏ(a) = 가 [ka] │
│ Meaning: the first syllable of │
│ '가다' (to go) │
└─────────────────────────────────────────┘
You just wrote your very first Hangul character.
Mini Quiz: Week 1
Q1. In what year did King Sejong create Hangul (창제)?
┌──────────────────────────────┐
│ A) 1392 │
│ B) 1443 │
│ C) 1446 │
│ D) 1910 │
│ │
│ Answer: ____ │
│ (Note: it was proclaimed │
│ to the public in 1446) │
└──────────────────────────────┘
Q2. Of the three slots — 초성, 중성, 종성 — which one holds vowels only?
┌──────────────────────────────┐
│ A) 초성 │
│ B) 중성 │
│ C) 종성 │
│ D) 초성 and 종성 │
│ │
│ Answer: ____ │
└──────────────────────────────┘
Q3. Where did the shapes of Hangul consonants come from?
┌──────────────────────────────┐
│ A) Shapes found in nature │
│ B) The shape of the mouth │
│ when producing the sound │
│ C) Simplified Chinese chars │
│ D) Derived from numerals │
│ │
│ Answer: ____ │
└──────────────────────────────┘
Q4. What is the principle of designing all vowels from "Heaven, Earth, and Humanity" called?
┌──────────────────────────────┐
│ A) 모아쓰기 │
│ B) 천지인(天地人) 원리 │
│ C) 가나다라 │
│ D) 훈민정음 │
│ │
│ Answer: ____ │
└──────────────────────────────┘
(Answers: Q1-B, Q2-B, Q3-B, Q4-B)
Activity Answer Key
Activity 1 — Linear → Block
ㄴ + ㅏ → 나 [na]
ㅁ + ㅏ → 마 [ma]
ㄱ + ㅗ → 고 [go]
ㄴ + ㅜ → 누 [nu]
ㅂ + ㅓ → 버 [beo]
ㄱ + ㅏ + ㅁ → 감 [gam]
ㄴ + ㅏ + ㄴ → 난 [nan]
Activity 2 — Spot the Consonants and Vowels
① 사람
사 = ㅅ(초성, consonant) + ㅏ(중성, vowel) + no 종성
람 = ㄹ(초성, consonant) + ㅏ(중성, vowel) + ㅁ(종성, consonant)
② 소
소 = ㅅ(초성) + ㅗ(중성)
→ Final consonant: (absent)
③ 산
산 = ㅅ(초성, consonant) + ㅏ(중성, vowel) + ㄴ(종성, consonant)
Consonant in the final slot: ㄴ
④ 이유
이 = ㅇ(초성) + ㅣ(중성)
유 = ㅇ(초성) + ㅠ(중성)
The ㅇ in the initial slot: (silent)
⑤ Classification
Consonants: ㄱ ㅁ ㅅ ㄴ
Vowels: ㅏ ㅓ ㅗ ㅣ
Activity 3 — Finding Vowel Position
1. 피자: 피 (circle ㅣ) 자 (circle ㅏ)
2. 우유: 우 (circle ㅜ) 유 (circle ㅠ)
3. 나무: 나 (circle ㅏ) 무 (circle ㅜ)
4. 오이: 오 (circle ㅗ) 이 (circle ㅣ)
Activity 4 — Two-Story vs. Three-Story
나/난: 2-story / 3-story
소/손: 2-story / 3-story
배/밤: 2-story / 3-story
Activity 5 — Color Traffic Light
1. 바나나
바 = ㅂ(blue) + ㅏ(red)
나 = ㄴ(blue) + ㅏ(red)
나 = ㄴ(blue) + ㅏ(red)
2. 레몬
레 = ㄹ(blue) + ㅔ(red)
몬 = ㅁ(blue) + ㅗ(red) + ㄴ(green) ← last slot: green
What You Learned This Week
- Hangul was created in 1443, proclaimed in 1446 — designed personally by King Sejong
- It was created in the face of strong opposition from government officials
- The Hunminjeongeum Haerye has preserved the design principles for 580 years
- Hangul uses block assembly (모아쓰기) — 초성·중성·종성 assembled inside a square
- Consonants go in the 초성 and 종성 slots; vowels go in the 중성 slot
- Consonants were modeled on the shape of speech organs; vowels on Heaven·Earth·Humanity (천지인)
- We dissected real words into their 초성·중성·종성 components
- Vowels divide into vertical (placed right) and horizontal (placed below)
- Batchim adds a third floor to a character (종성)
- We used the color traffic light to visually map out character structure
- You wrote '가 [ka]' with your own hand
"Next week: 천지인 (天地人) — Designing every vowel from just three shapes"
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