님 vs 씨: Korean Titles Explained
Written and reviewed by Jun and Jin, native Korean speakers
Published · How we write & review
After this page, you can add 님 (nim) or 씨 (ssi) to a name or role, and avoid the surname-plus-씨 trap.
10-second answer
The short answer
님 (nim) and 씨 (ssi) both attach to names or roles to show respect, but at different levels. 님 is more formal and respectful — attaches to roles (선생님 seonsaengnim, 사장님 sajangnim) or names in very polite contexts. 씨 is polite-neutral — the everyday way to address a coworker or acquaintance by name.
Quick check — did that land?
1. How do you politely address a coworker named 민수 (Minsu)?
민수 씨 is natural for a coworker.
Side by Side
| Suffix | Attaches to | Formality | Example |
|---|---|---|---|
| 님 (nim) | Roles/titles, sometimes full names | Higher respect | 선생님 (teacher), 사장님 (boss/owner), 고객님 (customer) |
| 씨 (ssi) | First names or full names | Polite-neutral | 민수 씨 (Minsu), 김민수 씨 (Kim Minsu) |
See also: Korean Name Structure Explained
Quick Examples
민수 씨, 이거 봐 주세요.
minsu ssi, igeo bwa juseyo.
Minsu, could you take a look at this?
Standard polite workplace address.
사장님, 안녕하세요.
sajangnim, annyeonghaseyo.
Hello, boss/owner.
님 attached to a role, no name needed.
김민수 님, 확인 부탁드립니다.
kim minsu nim, hwagin butakdeurimnida.
Mr./Ms. Kim Minsu, please confirm.
님 directly on a full name — common in formal emails, customer service, and official notices.
The 씨 Trap: Surname Alone Sounds Off
씨 attached to just a bare surname (김 씨) can sound distant, even slightly blunt, unlike English "Mr. Kim." The natural pattern is first name + 씨 (민수 씨) between colleagues, or full name + 씨 (김민수 씨) in slightly more formal but still everyday contexts.
님 Attaches to Roles Constantly
- 선생님 (seonsaengnim) — teacher, also used as a general respectful address for professionals
- 사장님 (sajangnim) — boss/business owner, a very common all-purpose respectful address for adults running a shop
- 고객님 (gogaeknim) — "honored customer," what service staff call you
- 기사님 (gisanim) — driver, covered on the taxi phrases page
This is why role + 님, with no name at all, is often the SAFEST way to address a stranger politely — you don't need to know anyone's name to use it correctly.
Common Mistakes
Mistake #1 — Using 씨 with someone clearly senior to you
씨 works between peers or toward someone you don't outrank — using it upward toward a much older or senior person can sound presumptuous. 님-based titles are safer there.
Mistake #2 — Attaching 씨 to a bare surname
김 씨 alone can read as curt — pair 씨 with a first name or full name instead.
At the opposite end from 님 and 씨 is the casual 야/아 (yah) you attach to a close friend's name.
Mini Quiz
2. What does 사장님 let you do?
3. Why might 김 씨 alone sound a bit blunt?
Related Knowledge
Learn Next
님/씨 are one piece of the honorific system — see the full picture of how respect is built into Korean grammar.
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