Ssi vs Nim in Korean: Meaning, Rules and Examples

What you'll learn

• Choose 씨 or 님 for a coworker, a boss, a teacher and a customer.
• Attach each suffix correctly, with or without a space.
• Explain why a title plus 씨 and a surname plus 씨 are mistakes.
• Make the verb match a 님 person with the honorific -(으)시-.

Before you start: you should know that Korean has a polite ending (-요) and an honorific marker (-(으)시-). If not, read the Korean word for you first, because it explains why Korean names the listener. Audio plays only when you press a button.

What Does Ssi vs Nim in Korean Mean?

Ssi vs nim in Korean means choosing between 씨 and 님 when you call or mention a person. A suffix is a small word part that attaches to the end of another word. 씨 attaches to a name and says "polite, same level". 님 attaches to a title or a name and says "respected person".

Why does Korean need both? Korean has no word like "Mr." that fits every person. A speaker must decide whether the other person is an equal, a junior or someone to raise, and the suffix carries that decision. The decision matters most at work, at school and in shops.

Compare two greetings:

• 민수 씨, 안녕하세요? (minsu ssi, annyeonghaseyo?) = "Hello, Minsu." The speaker greets a coworker of similar rank.
• 사장님, 오셨어요? (sajangnim, osyeosseoyo?) [사장님 오셔써요] = "Boss, you are here?" The speaker greets the company president.

A First Example, Labelled

In the first greeting, 민수 is the given name, 씨 is the suffix, and 안녕하세요 is the polite greeting. In the second, 사장 means "company president", 님 is the suffix, and 오셨어요 is the verb 오다 (to come) with the honorific -(으)시-, the past marker 었 and the ending 어요. The title alone already means "you", so no pronoun appears. The next section turns these examples into rules.

How Does Ssi vs Nim in Korean Work?

Ssi vs nim in Korean works by matching the suffix to the position of the person and to the thing before the suffix. 씨 follows a name. 님 follows a title, or a name in service settings. Never put 씨 after a title, and never use either suffix for yourself.

Three rules cover almost every case:

1. 씨 follows a full name or a given name. Write a space before it: 김민수 씨, 민수 씨.
2. 님 follows a title with no space. 선생님, 사장님, 부장님. A job title is not given a space before 님.
3. 님 can also follow a name, with a space. Companies and apps write 김민수 님 for a customer or member they do not know personally.

Pattern Table

The table shows each common form, what it attaches to, who may say it to whom, and an example. This is the master table for the pair.

Two details in the table need a note. First, 손님 does not take another 님, because 손 + 님 is already inside the word. Second, 선배 on its own is common between friends, and 선배님 is more formal. The lesson on Korean honorific nouns lists other words that already carry respect.

The table covers the forms. The worked example below shows how a speaker picks one.

Worked Example: Choosing 씨 or 님 for One Person

Choosing between 씨 and 님 takes five steps. The sentence is "Please have some coffee," and the listener is Kim Minsu.

1. Find the relationship. Case A: Minsu is a coworker your age. Case B: Minsu is the department head.
2. Check for a title. Case A has no title that you use. Case B has the title 부장.
3. Choose the suffix. Case A takes 씨, giving 민수 씨. Case B takes 님 after the title, giving 김 부장님 or 부장님.
4. Choose the verb. Both listeners get polite speech with the honorific: 드세요 (the polite form of 드시다, "to have").
5. Read the result. Case A: 민수 씨, 커피 드세요. (minsu ssi, keopi deuseyo.) Case B: 부장님, 커피 드세요. (bujangnim, keopi deuseyo.)

You will know it worked when the suffix matches the position and the title or name has not been mixed with the wrong suffix. The common slip at step 3 is writing 부장 씨. A title already carries the person's position, and 씨 would pull the person down to an ordinary name. The verb in step 4 stays the same here, but when you talk about a 님 person with a third listener, the honorific is required: 부장님이 오셨어요. The next section compares the choices.

How Is 씨 vs 님 Different from Using No Suffix?

The difference between 씨, 님 and no suffix is the amount of respect and distance. 님 shows the most respect and the most distance. 씨 shows polite equality. A bare name shows closeness. A speaker slides along this scale as a relationship develops.

Verdict: 님 is the safe default for anyone higher in rank, any customer and any guest. 씨 is the safe default for a peer or junior in a polite setting. A bare name is only for people who have agreed to be close. When you cannot tell, 님 with a title is rarely a problem, while 씨 can be.

An example shows the risk. A new employee greets the section chief with 김철수 씨, 안녕하세요? The chief may smile politely, but many chiefs would hear a lack of respect. The same employee greets with 김 과장님, 안녕하세요? and the hesitation disappears.

The comparison shows how the choices differ. The next section covers cases that bend the rules.

When Do You Use 씨 and 님, and When Not?

Use 씨 and 님 according to the setting, and watch for four exceptions. Each one gives the rule and an example.

• Customer service. Staff call you 고객님 on the phone and in apps, and 손님 in a shop or restaurant. Writers use 김민수 님 for a member or a buyer. The verb goes with the honorific: 고객님, 주문하신 상품입니다.
• A surname alone. 김 씨 is not a polite address. The dictionary also has 김씨 without a space for a family name, and 김 씨 can refer to a Mr. Kim in a flat or dismissive way. Say 김민수 씨, or 김 선생님 if you want to use the surname.
• A title with a surname. A surname plus a title is the normal workplace form: 박 부장님. Without the surname, 부장님 alone is also fine when the person is in front of you.
• Official lists and announcements. Announcers say 참가자 김민수 씨 (participant Kim Minsu) because the speaker is neutral and the audience is wide. This is the one common case where a stranger of any age gets 씨.

An honest limit: workplaces differ. Some companies use 님 for everyone, including juniors, to flatten rank, and some friends drop 씨 within a week. The lesson on Korean names and how to address them describes address in work and family settings. The lesson on honorific vs polite speech in Korean explains why the verb follows the person you raise.

The exceptions show the limits of the table. The next section lists the mistakes that result.

What Mistakes Do Learners Make with 씨 and 님?

Learners usually make five mistakes. Each one has a quick repair.

1. Calling a boss or teacher by name plus 씨. Learners often assume that 씨 is the Korean "Mr." and fits everyone. Actually, 씨 is for equals and juniors. Calling a teacher 김민수 씨 lowers the teacher. Fix: 선생님 or 김 선생님.
2. Putting 씨 after a title. 부장님 씨 and 선생님 씨 are wrong. The title already shows rank. Fix: use the title plus 님 alone.
3. Using a surname plus 씨 to address someone. 김 씨, 이쪽으로 오세요 sounds cold. Fix: 김민수 씨 or the title.
4. Using 님 for yourself. 저는 민수 님입니다 is wrong. A speaker never raises themselves. Fix: 저는 민수예요 or 저는 김민수입니다.
5. Forgetting that 님 people take the honorific verb. 사장님이 와요 treats the president as an ordinary person. Fix: 사장님이 오세요 or 사장님이 오셨어요.

Use this checklist when a sentence sounds off: Is the person higher, equal or lower than me? Does the suffix follow a title or a name? Does the verb match the same person? Practice puts the checklist to work.

Practice and Answers

Try the four items before you read the answer key. Cover the answers with your hand.

1. Choose the form. You greet your department head, whose surname is 박. Complete: 박 ___, 안녕하세요? (씨 / 부장님)
2. Fix the error. A learner says 선생님 씨, 질문 있어요. What should they say?
3. Translate. "President, did you come?" Use 사장님 and the past honorific form.
4. Write your own. Write one greeting to a coworker your age and one to a customer in a shop.

Answer key

1. 부장님. The sentence is 박 부장님, 안녕하세요? A department head gets the title plus 님, and 씨 would be too casual.
2. 선생님, 질문 있어요. A title and 씨 never appear together. If the teacher is 김 선생님, say 김 선생님, 질문 있어요.
3. 사장님, 오셨어요? (sajangnim, osyeosseoyo?) The verb is 오다 plus -(으)시-, the past marker and 어요.
4. Answers vary. A model pair: 민수 씨, 안녕하세요? for the coworker and 손님, 뭐 드릴까요? from staff to a customer. Check that the coworker greeting has a name plus 씨 with a space, and that no title is joined to 씨.

A rule of thumb for checking your own work: if the person is above you or paying you, use a title plus 님. If the person is on your level, use a name plus 씨.

Next Lessons after Ssi vs Nim in Korean

After ssi vs nim in Korean, study the neighbouring pieces one at a time. This lesson explains two suffixes but does not teach every title, family word or workplace custom.

1. Read the Korean word for you to see how names and titles replace "you" in a sentence.
2. Continue with Korean honorific nouns for words that already carry respect.
3. Learn the family words in Korean older sibling titles 오빠 언니 형 누나.
4. Review the typical errors in Korean honorific mistakes.
5. Compare respect for the listener and for the subject in honorific vs polite speech in Korean, then study Korean humble forms 드리다 뵙다.
6. Return to Korean honorifics to see every lesson in the set.

With these steps, ssi vs nim in Korean becomes a quick decision: rank the person, then add 님 to a title or 씨 to a name.

Frequently Asked Questions

What is the difference between 씨 and 님?

씨 is a polite suffix for equals and juniors, as in 민수 씨. 님 is a respectful suffix for seniors, customers and guests, as in 선생님 and 고객님. Use 님 when you want to raise the person, and use 씨 when the person is on your level. When unsure, a title with 님 is the safer choice.

Can I call my boss by name plus 씨?

No. Name plus 씨 treats the boss as an equal or a junior, which sounds rude or careless in most workplaces. Use the job title plus 님 instead, such as 부장님 (department head) or 사장님 (company president). If you do not know the title, use the surname plus the title, or 선생님 as a polite fallback.

Do I use 씨 after a surname only?

No. Say the given name or the full name: 민수 씨 or 김민수 씨. A surname alone plus 씨, as in 김 씨, refers to a Mr. Kim in a flat or even dismissive way and is not a polite way to address him. In Korean workplaces a surname is usually followed by a title, such as 김 대리님.

Why do shops call me 고객님 or 손님?

Both are polite words for a customer. 고객님 is the standard in service speech and writing, such as phone calls, apps and notices. 손님 is the usual spoken word in a shop or restaurant and already means "guest" or "customer", so it needs no extra 님. Staff use them to raise you without knowing your name.

Should the verb change with 씨 and 님?

With 님 titles, yes. Speaking about a 님 person, add the honorific -(으)시-: 사장님이 오셨어요 (The president has come). Speaking to a 씨 person, you normally use a polite ending, and -(으)세요 is common and kind: 민수 씨, 이거 드세요. The honorific tracks the person who acts, not the suffix.