Korean is famously phonetic — “you read exactly what you see.” Then you hear a native speaker say 입니다 as [임니다] and 학교 as [학꾜], and the promise falls apart.
Here’s what’s actually true: Korean pronunciation is perfectly regular, but the rules operate on connected syllables, not isolated letters. Once you know the six sound-change rules below, spoken Korean stops sounding “mumbly” and starts sounding exactly like what’s written.
This is the complete guide — every rule, when it triggers, and the highest-frequency example words to drill.
Why Korean Sounds Different From Its Spelling
Every Korean syllable can end in a consonant — the batchim (받침). When that final consonant collides with the first sound of the next syllable, Korean smooths the transition. English does this too (notice how “handbag” becomes “hambag” at speed) — Korean just does it systematically.
Two facts before the rules:
- Only 7 sounds can end a syllable. All 27 possible batchim letters reduce to [k], [n], [t], [l], [m], [p], or [ng].
- The rules apply in order, automatically, every time. No exceptions to memorize — just patterns to internalize.
Rule 1: Liaison (연음) — The Consonant Slide
When: batchim + syllable starting with ㅇ (vowel sound). What happens: the final consonant slides over to start the next syllable.
| Written | Pronounced | Meaning |
|---|---|---|
| 음악 | [으막] eu-mak | music |
| 한국어 | [한구거] han-gu-geo | Korean language |
| 먹어요 | [머거요] meo-geo-yo | eat |
| 이름이 | [이르미] i-reu-mi | name (+ subject particle) |
This is the most frequent rule in the language — every verb conjugation with 어/아 triggers it.
Rule 2: Nasalization (비음화) — Stops Become Nasals
When: stop consonant (ㄱ, ㄷ, ㅂ) + nasal consonant (ㄴ, ㅁ). What happens: the stop becomes its nasal partner: ㄱ→ㅇ, ㄷ→ㄴ, ㅂ→ㅁ.
| Written | Pronounced | Meaning |
|---|---|---|
| 입니다 | [임니다] im-ni-da | is/am/are |
| 감사합니다 | [감사함니다] gam-sa-ham-ni-da | thank you |
| 학년 | [항년] hang-nyeon | school year |
| 먹는 | [멍는] meong-neun | eating |
If you only master one rule, make it this one — it appears in 입니다 and 합니다, which end half the polite sentences in Korean. Full deep-dive: Korean nasalization explained.
Rule 3: Tensification (경음화) — The Double-Up
When: a stop batchim ([k], [t], [p]) is followed by ㄱ, ㄷ, ㅂ, ㅅ, or ㅈ. What happens: the second consonant becomes tense: ㄲ, ㄸ, ㅃ, ㅆ, ㅉ.
| Written | Pronounced | Meaning |
|---|---|---|
| 학교 | [학꾜] hak-kkyo | school |
| 식당 | [식땅] sik-ttang | restaurant |
| 국밥 | [국빱] guk-ppap | rice soup |
| 숙제 | [숙쩨] suk-jje | homework |
Rule 4: Aspiration (격음화) — The ㅎ Merger
When: ㅎ meets ㄱ, ㄷ, ㅂ, or ㅈ (in either order). What happens: they fuse into the aspirated version: ㅋ, ㅌ, ㅍ, ㅊ.
| Written | Pronounced | Meaning |
|---|---|---|
| 좋다 | [조타] jo-ta | to be good |
| 입학 | [이팍] i-pak | school admission |
| 축하해요 | [추카해요] chu-ka-hae-yo | congratulations |
| 어떻게 | [어떠케] eo-tteo-ke | how |
축하해요 [chu-ka-hae-yo] is the word learners mispronounce most — now you know why it’s not [chuk-ha-hae-yo].
Rule 5: Palatalization (구개음화) — The 이 Effect
When: batchim ㄷ or ㅌ + the vowel 이. What happens: ㄷ→ㅈ, ㅌ→ㅊ.
| Written | Pronounced | Meaning |
|---|---|---|
| 같이 | [가치] ga-chi | together |
| 굳이 | [구지] gu-ji | insistently |
| 해돋이 | [해도지] hae-do-ji | sunrise |
Low frequency, but 같이 (together) is one of the most common words in Korean — so you’ll use this daily.
Rule 6: Liquid Assimilation (유음화) — The ㄹ Takeover
When: ㄴ meets ㄹ (either order). What happens: both become [ㄹ].
| Written | Pronounced | Meaning |
|---|---|---|
| 연락 | [열락] yeol-lak | contact |
| 신라 | [실라] sil-la | Silla dynasty |
| 설날 | [설랄] seol-lal | Lunar New Year |
Reading Practice: Rules in Combination
Real words often stack rules. Try these — say each out loud:
| Written | Pronounced | Rules used |
|---|---|---|
| 국물 | [궁물] gung-mul | nasalization |
| 읽어요 | [일거요] il-geo-yo | liaison (double batchim) |
| 입학년도 | [이팡년도] i-pang-nyeon-do | aspiration + nasalization |
| 못 잊어 | [몬니저] mon-ni-jeo | nasalization + liaison |
If you can read all four correctly at speed, you’re ahead of 90% of learners.
How to Actually Internalize These Rules
Reading about rules ≠ applying them at reading speed. The gap closes with:
- Word-level drills, not rule memorization. Drill 감사합니다 until [gamsahamnida] is automatic; the rule comes along for free.
- Reading out loud daily — start with our Korean reading practice exercises.
- Tongue twisters — the fastest stress test. Try our Korean tongue twisters.
- Instant feedback. The Batchim app drills all six rules adaptively and corrects you in real time — the same system as this guide, made automatic.
Understand blocks first? Start with how Hangul syllable blocks work, then come back and layer the sound rules on top.