Learning Japanese as a Korean Speaker: The Closest Neighbour

The head start: your sentences already have the right shape

The first thing you will notice is that a Japanese sentence goes together in the order you already think in. The verb comes last, the topic comes first, and the particles that mark each role sit after the noun, exactly where Korean puts them. Where an English speaker has to rebuild every sentence from the verb outwards, you can translate almost slot for slot: jeoneun hakgyoe gayo becomes watashi wa gakkō ni ikimasu with each piece in the same place. Many learners find they can hold a simple conversation within their first weeks for this reason alone.

The table below lists the mappings that hold up in ordinary speech. Two need care. Korean eseo covers both the place where something happens and the place something comes from, but Japanese splits that into de and kara. And Korean ui, the possessive, is often dropped in speech where Japanese no stays in.

Sino-Korean words you can reuse

Both languages borrowed a large part of their vocabulary from Chinese, and the borrowings often line up. Once you hear a few pairs, the sound shifts become predictable: a Korean final k tends to become a Japanese ku or ki syllable, a final l tends to become tsu or chi, and final n and ng survive as n or a long vowel. Yak to yaku in yakusoku, il to ichi, jeol to setsu, and dong to dō in undō show the pattern.

Do not trust the meaning blindly. A few well-known pairs have drifted. Korean gongbu means study, but Japanese kufū means devising a clever way; the Japanese word for study is benkyō. Korean aein means a girlfriend or boyfriend, while Japanese aijin usually means a mistress. Korean palbangmiin praises an all-rounder; Japanese happō bijin criticises someone who tries to please everyone. Korean gicha is any train, but Japanese kisha is an old steam train, and the everyday word is densha.

One more drift is worth knowing because you will say it often. Korean gibun nappayo means you are in a bad mood or offended. Japanese kibun ga warui usually means you feel physically unwell. If you want to say something upset you, iya na kimochi desu or a plainer chotto komarimashita lands closer to what you mean.

Honorifics: the same logic with one big difference

You already know how to raise the person you are speaking about and adjust your ending for the person you are speaking to, because Korean does both. Japanese sonkeigo, the respectful verbs such as irassharu and ossharu, will feel like the Korean honorific infix si in malsseumhasyeosseoyo. Japanese also has a fuller set of humble verbs than Korean: where Korean has a few, such as deurida and boepda, Japanese has a whole vocabulary, including ukagau, mōsu, and itasu, that lowers the speaker.

The difference that catches nearly every Korean speaker is who gets lowered. Korean honorifics are usually absolute: your boss is your boss, so you say sajangnimkkeseo an gyesimnida to an outside caller. Japanese honorifics are relative: when you speak to someone outside your group, you lower your own side, including your boss and your parents. To an outside caller, Tanaka the department head becomes plain Tanaka, with no san and a humble verb. Your own father is chichi, not otōsan, when you mention him to someone else.

Notice the pairs. You raise the other company's buchō with irasshaimasu ka and lower your own Tanaka with orimasu. You raise someone else's father with otōsan and lower your own with chichi. The dedicated honorifics guide on this blog covers the full verb list; the relative rule is the piece you need to consciously override, because your Korean instinct will tell you it is rude.

The four sounds that mark a Korean accent

Japanese has fewer consonants than Korean, so the difficulty is not learning new sounds but keeping apart sounds that Korean treats as the same. Korean plain stops are voiceless at the start of a word and voiced between vowels, so the k in gogi and the g in the middle of it are, to a Korean ear, one sound. Japanese treats k and g, t and d, p and b as different sounds in every position. Many learners find they say daigaku, university, so that a Japanese listener hears taigaku, leaving school.

The other three are tsu, which Korean does not have and which tends to come out as chu or ssu; the z sounds, which Korean lacks and which tend to come out as j, so that mizu sounds like miju; and voiceless stops between vowels, which tend to get voiced by the Korean habit, turning kata into kada.

The last line is there for contrast. Jugyō and jū contain the real j sound, and mizu and zenzen do not. Say mizu, then jū, and feel the tongue drop for the z and rise for the j. If both feel the same in your mouth, the z is not there yet.

Long vowels and pitch

Modern Seoul Korean does not use vowel length to tell words apart, so the habit is to shorten every vowel to one beat. Japanese long vowels are two full beats and they change meaning: obasan is an aunt and obāsan is a grandmother, biru is a building and bīru is a beer. The city you call Dokyo is Tōkyō, with both o sounds held long. Many learners find this the most persistent trace of a Korean accent because nothing in Korean makes it feel wrong.

Pitch is the softer version of the same problem. Seoul Korean carries meaning through phrase intonation rather than through the pitch of each word, while standard Japanese gives each word a pitch shape. You do not need to memorise pitch for every word; you need to stop applying Korean phrase intonation, which tends to rise at the end of a phrase, and copy the flat or falling shapes you hear. Speakers of Gyeongsang dialects, which do have word pitch, may find this part more familiar.

Kanji is where your time will go

Grammar and particles come fast for you, which means kanji becomes the main workload much sooner than for most learners. Korean writing moved to hangul alone, so unless you studied hanja at school, you are learning the character shapes from nothing. What you do have is the Sino-Korean sound system. Most characters carry an on reading that descends from the same Chinese source as the Korean reading, so hak in hakgyo points toward gaku in gakkō, and gyo toward kō. Learning the on reading through its Korean cousin roughly halves the memorising for that reading.

The native kun readings have no Korean cousin. Yama for 山 and mizu for 水 have to be learned as vocabulary, in words, out loud. The efficient approach for a Korean speaker is to learn words rather than characters, tie each on reading to a Korean word you know, and read hiragana-rich beginner texts aloud so that the kun readings arrive as speech before you meet them on paper.

• For every new character, write the Korean reading of the same hanja next to the Japanese on reading and notice the shift.
• Learn the kun reading inside one spoken word, never as an isolated syllable.
• Read short texts aloud daily so that your reading speed and your speaking speed grow together.
• Use the gakkō no gaku pattern when you ask about a character; it is how Japanese speakers identify kanji in speech.

Do not translate your sentence endings

Because the grammar lines up so well, the temptation is to translate the whole sentence including the ending. That is where Korean speakers produce Japanese that is grammatical and strange. The Korean future and intention marker gess has no single Japanese partner: algesseumnida is wakarimashita, a plain past, and gamsahagesseumnida is tasukarimasu or arigatō gozaimasu, never a conjectural deshō. Jal meogeosseumnida after a meal is gochisōsama deshita, not a sentence about eating well.

Three more habits to watch. Korean uri, our, for your own family or company becomes plain watashi no or uchi no in Japanese; watashi-tachi no okāsan sounds like a shared mother. Korean itda covers both people and things, but Japanese uses imasu for people and animals and arimasu for objects. And Korean gyeolhonhaesseoyo, a past form for being married, is kekkon shite imasu in Japanese, a present state.

The last line replaces the Korean leaving formula meonjeo gabogesseumnida, and it is paired with the reply otsukaresama deshita. Also note that Korean ne, yes, sounds exactly like the Japanese particle ne. Many learners answer a question with ne and are heard as trailing off. The Japanese yes is hai.

The politeness level that does not exist in Japanese

Korean has a comfortable middle register, the yo form, that is polite without being formal, and a formal one, the seumnida form, above it. Japanese has the desu and masu form and then plain form below it. Many learners map seumnida to masu and yo to plain form, and the second half of that mapping is wrong. Japanese plain form is banmal: it is what you use with close friends and family. The Japanese equivalent of everyday yo speech is still desu and masu, said with relaxed intonation and softened by ne and yo.

Your first month of speaking

Your grammar lets you speak from the first week, so use the month to build good sound habits before the fast, fluent, slightly Korean-sounding Japanese sets in. Each week adds one focus while keeping the earlier ones alive.

• Week one: self-introduction and daily routine using particle transfers. Record every session and check only two things, voiced starts and long vowels.
• Week two: add the tsu and z words. Say the minimal pairs from this guide at the start of every session, then use three of them in sentences.
• Week three: honorific practice with the relative rule. Talk about your own boss, teacher, and parents to a stranger and to a friend, lowering and raising on purpose.
• Week four: sentence endings. Retell your day without translating from Korean, watching for gess, uri, itda, and past forms for states.
• Every day: read one short text aloud, tapping the beats, and identify every kanji through a Sino-Korean word you know.

Expect fast progress and a specific shape of plateau. Your listening and grammar will run ahead of your reading, and your accent will be understood but recognisably Korean until you fix the four sounds. Both are solvable with deliberate work, and the second is worth doing early, before the habits are fluent.