The letters go in over a morning and the blocks are what actually has to be learned. Korean does not write its letters in a line; it packs each syllable into a square, with a fixed internal layout decided by the shape of the vowel, and reading fluently means seeing the square as one unit rather than taking it apart into two or three letters.
So the morning buys the ability to sound out a sign, and the fortnight after it buys the ability to read without noticing. The second is the part people skip.
Six facts and hangul is done
- 14 consonants and 10 vowels in the basic set, combining into everything else. The whole inventory fits on one page.
- letters group into syllable blocks, written in a square rather than a line, so a written syllable is one visual unit made of two or three letters.
- ㄱ pictures the tongue at the back of the mouth, and the other consonant shapes are equally deliberate. The system was designed to be teachable and it shows.
- ㅇ is silent at the start of a syllable, acting as a placeholder so a vowel has something to sit against, and it is ng at the end. One shape, two jobs, decided by position.
- batchim is the final consonant of a block, and its sound changes depending on what follows, which is where the pronunciation rules live.
- it is genuinely a one day job, and every hour spent on romanised Korean afterwards is wasted.
How a block is assembled
Every syllable starts with a consonant position, and if the syllable begins with a vowel sound that position is filled by a silent placeholder, which is the single fact that unlocks half of the confusing blocks a beginner meets. The vowel then goes to the right of the consonant or underneath it, and which one is decided by the vowel's own shape: tall vowels sit on the right, wide ones sit below.
A final consonant, if there is one, goes at the bottom of the square, and two of them can sit there together. That bottom slot is where the sound rules described elsewhere do most of their work, because a consonant sitting at the bottom of one block behaves differently depending on what starts the next one.
The letter shapes themselves are systematic rather than arbitrary, which is why they go in so fast. The consonant signs are diagrams of the mouth making them, and adding a stroke to a sign adds aspiration to the sound, so the plain and the aspirated versions of a consonant look like each other on purpose. Doubling the sign gives the tense series. A learner who notices that is learning three related shapes rather than three separate ones.
The romanisation that never gets put down
Here is the stall, and it is available in Korean in a way it is not in most languages. There is an official romanisation, it is everywhere, on street signs and album covers and subtitles, and a learner can read Korean words in Latin letters indefinitely without ever being forced onto hangul.
What that costs is precise. The romanisation records the spelling rather than the sound in some places and the sound rather than the spelling in others, so it is systematically misleading about exactly the sound rules that matter, and a word learned through it is stored in a shape that will not match either the page or the ear. The exit is a decision rather than a technique: do the morning, then remove romanisation from your own notes and cards entirely, including from the ones you have already made. It is uncomfortable for about a week and it is the cheapest week in the subject.
Three series, one shape each
The consonants, and how the shapes encode the difference
Read down a column: the three rows are the same letter with a stroke added and then doubled, and the sounds are related in the same way.
Shading is how much is added to the basic shape: zero is the plain sign, one adds a stroke, two doubles it. The romanised sounds are printed in each cell.
The plain row carries two romanisations each because the same letter is heard differently depending on where it sits in the word, which is a sound rule rather than a second letter. That row is also the one an English ear finds hardest to keep apart from the tense row.
Two things for the first fortnight
A chart organised by the design rather than alphabetically is worth finding, because the design is the mnemonic. It replaced the alphabetical chart, which presents the letters in an order that hides the family resemblances and turns a systematic set into a list of thirty. Free versions are everywhere and the one to pick is the one that groups plain, aspirated and tense together.
A Korean keyboard on your phone is the second, and it does something no chart can. Typing hangul assembles blocks: you enter letters in order and watch the square build itself, which teaches the layout rules by making you produce them dozens of times a day. It replaced copying the letters out by hand, which trains the hand while the eye stays slow. Free, and two minutes to add.
The mistake: reading a block as three letters
A beginner decodes each square into its parts, sounds them out and reassembles them, which works and is about a third of the speed of reading. It also never improves on its own, because every square is being solved rather than recognised, and solving does not become recognising through repetition of solving.
What moves it is volume of very easy text read fast, accepting mistakes: signs, labels, the names of things you already know, a page of a children's book, ten minutes a day. Somewhere in the second or third week the squares start arriving whole. Everything above reading depends on that having happened, and a learner still assembling blocks while trying to learn grammar is paying twice for every sentence, which is the ordinary argument about foundations in why you forget, and the schedule that beats forgetting.
What the alphabet does not cover
Sounding out a block correctly and saying the word correctly are different things, because the spelling preserves the word rather than recording the sound, and a set of rules reshapes it at every boundary, in sounds that shift depending on their neighbours. The words being assembled belong to two parallel vocabularies with different registers, in native Korean, Sino Korean, and when each is used. And the endings on those words carry both the grammar and the relationship to the listener, in particles, and endings that change with who you address.