Try it, don’t just read it

The same calendar decides your zodiac animal. Not the year you were born — the lunar year. If you were born in January or early February, you are probably not the animal you thought you were.

Under 세는나이 you were one year old on the day you were born, and everyone aged together at New Year. 연 나이 simply subtracts your birth year, which is how the law decided when you could drink or be drafted. 만 나이 is the age the rest of the world uses. In June 2023 Korea made the last one the legal standard — but the other two did not disappear from ordinary speech, and one of them is still the rule for alcohol and military service.

It is not. More than half of Korean vocabulary is built from Sino-Korean roots, and the roots repeat. 학 turns up in 학교, 학생, 학년, 학기, 유학, 과학. Learn the root once and six words arrive together — then sixty. Learners who never notice this end up memorising words one at a time, which is exactly where the intermediate wall is.

One catch, and it is the interesting one: the same sound can be several different roots. 문 is a gate (門), writing (文), and asking (問) — three unrelated characters wearing the same Hangul. Type 문 below and you will see all three.

Which means 2:30 is 두 시 삼십 분. The hour is native, the minutes are Sino, and the system changes halfway through a single time. Nobody tells learners this; they just get corrected for years.

There is also a limit worth knowing: native numbers stop at 99. Past that, everyone switches, even for things you could point at.

This is where intermediate learners get into trouble, and the trouble is specific: the grammar is correct and the register is wrong. Saying 가자 to someone ten years older is not friendly. It is the same sentence with a different social claim attached.

Subtitles erase this layer completely. When a K-drama character switches from 존대말 to 반말 mid-scene, something enormous just happened — and the English line reads exactly the same as before.

Korean computer keyboards use one fixed layout (두벌식) where every key is a specific letter — 자 is always ㅈ, 아 is always ㅏ. Because the mapping never changes, the mistake can be undone by calculation alone: no dictionary, no guessing, just the same keys read in the other alphabet. It works the other way too — Korean keys left on while you meant to type English produce strings like ㅑㄷㄷ for “add”.

It only undoes the keystrokes. It has no way to know whether the result is a real word in either language — that part is still up to you.

It works because of where Korean syllables put their first sound. Every syllable block starts with a consonant slot — the 초성 — and typing just that slot is enough for a Korean reader to guess the rest, the same way “thx” works in English but more systematically. Type only consonants below (ㄱㅅㅎㄴㄷ) and it searches by that first-sound pattern; type a full word or an English meaning and it searches normally.

If the word ends in a consonant sound (받침, batchim), Korean needs an extra vowel to bridge into the particle — 사람 + 은, 책 + 이. If it ends in a vowel already, the particle attaches directly — 나무 + 는, 친구 + 가. Every particle pair in the table below follows this same split, including ones learners often meet separately, like 으로/로 for direction — which has its own exception for words ending in ㄹ.

Type any noun and the table below recalculates from the rule, not from a lookup — the same way a Korean speaker does it without thinking.

100,000 reads as “one hundred thousand” in English — two words, broken after the 100. In Korean it is 십만: ten 만. The digits never moved; the grouping did. This is why prices in the tens of thousands feel instant to a Korean speaker and take a beat for everyone else, and why 1억 (one 억) is a hundred million, not a billion — a number that comes up constantly in conversations about apartments and salaries.

The tool below shows both groupings for the same number, side by side. Once you can see where Korean cuts, the words stop needing translation.

The fixed dates — Liberation Day, Hangul Day, Memorial Day — are modern national commemorations, set on the solar calendar the country adopted in 1896. The moving ones — Seollal, Chuseok, Buddha’s Birthday — are the old festivals, and they never left the lunar calendar. So they drift across the solar year: Seollal can fall anywhere from late January to late February.

Seollal and Chuseok are also three days each, not one, and effectively the whole country travels at the same time. Knowing which week they land in is the difference between a good trip and an impossible one.