KakaoTalk Business Message Etiquette: How to Message Korean Coworkers

BLUF: KakaoTalk business message etiquette in Korea comes down to formality and hierarchy. Default to formal speech (존댓말), address coworkers by title plus 님 rather than first name, open with a short greeting that identifies you, and respect work hours when you message Korean coworkers. KakaoTalk is the main work channel at most Korean companies, so the same tone rules that govern face-to-face interaction apply in the chat — only with less room to read body language. Get the formality level and the timing right and most other mistakes are forgiven.

Default to formal speech (존댓말)

Korean encodes respect in the grammar itself, so the single most important rule of Korean business messaging etiquette is to use 존댓말 — the polite, formal register — with anyone senior to you or outside your immediate team. Casual speech (반말) is reserved for close peers, and even then only after they have made it clear it is welcome. As a foreigner, you are never penalized for being too formal, but dropping into casual form too early reads as disrespectful. When unsure, end your sentences politely (~요, ~습니다) and you will stay safe.

Address people by title, not first name

In a Korean work context, people are addressed by their role, not their given name. Use 팀장님 (team lead), 과장님 (manager), 대리님, or 선배님, often with the family name in front: 김 부장님. Calling a senior coworker by first name alone — normal in many Western offices — comes across as overly familiar or rude. When you do not know someone's exact title, 선생님 or 님 after their name is a safe, respectful fallback.

Open with a greeting and say who you are

Korean work messages rarely jump straight to the request the way an English Slack ping might. Start with a brief greeting like 안녕하세요 and, if the person may not have your number saved, identify yourself and your team in the first line. A short 수고하셨습니다 ("thank you for your hard work") at the close is standard and signals goodwill. This light framing is the Korean equivalent of the etiquette you would use to write professional messages on Slack — warm opening, clear point, polite close.

Respect work hours and response timing

KakaoTalk's read receipts (the disappearing "1") mean people can see whether you have opened a message, which raises the pressure to reply promptly during the day. At the same time, after-hours and weekend work messages are increasingly frowned upon in Korea, and some firms actively discourage them. If something is not urgent, hold it until the next business day, or add a line saying 급하지 않으니 천천히 보셔도 됩니다 ("no rush, reply whenever"). Reading a message and ignoring it for hours, on the other hand, can read as cold.

Keep emojis, stickers, and slang in check

Kakao stickers and emojis are part of everyday Korean chat, and a single friendly one can soften a message nicely. But calibrate to your audience: modest with seniors and in formal threads, looser with peers. Avoid internet slang and abbreviations (ㅋㅋ, ㅇㅋ) when messaging someone senior, since they signal casual familiarity you may not have earned yet. The goal is the same as anywhere — natural and friendly without tipping into careless.

Read the hierarchy in group chats

Most Korean teams run a KakaoTalk group chat (단톡방), and the rank order in the room shapes how you write. Acknowledge instructions from a senior with a clear 네, 알겠습니다 rather than a bare thumbs-up, and avoid talking over or correcting a senior in front of the group. If you need to push back or politely decline a request, do it gently and, when it is sensitive, in a direct message rather than the open room. Reading the hierarchy correctly is half of messaging Korean colleagues professionally.

When you are unsure, check before you send

If your Korean is still developing, the safest habit is to slow down on anything sensitive — a message to a senior, a refusal, a sincere apology. You do not need perfect grammar; clear, formal, and respectful beats fluent and careless. On a Mac, you can select an incoming Korean message and have Nugumi explain what it really means and the tone behind it, polish your own draft so it reads natural and properly formal, or draft a reply in your voice — right inside KakaoTalk, without copying text anywhere. You can download it and try it on your next real work message.