비밀연애 (bimil-yeonae)

비밀연애 (bimil-yeonae) means a relationship that two people keep going without telling anyone around them — a romance only the two of them know about. When you watch Korean dramas, the scene tends to show up before the word does. Two people are left alone in the office elevator, and they don’t even hold hands until the doors open. At the team dinner, they deliberately take seats at opposite diagonal ends of the table. Then someone spots that they’re wearing matching rings, and by the next day the rumor is going around the office.

Because the word “secret” is attached, it can sound like there’s something shady about the relationship, but that’s not what 비밀연애 means in Korean. There’s nothing wrong with the relationship itself. It’s just that everything that would follow if people knew — coworkers’ looks, parents’ questions, fans’ reactions — feels like too much, so the two of them have decided to keep a lid on it for now. That’s why the word carries three things at once. First, the relationship is real. Second, the decision not to tell isn’t one person’s lie; it’s an agreement between two people. Third, it doesn’t go on forever. It ends one of three ways: they go public, they get caught, or they break up. Because of that “temporary” feeling, 비밀연애 always carries a faint edge of restlessness.

The pronunciation is worth pausing on, too. Letter by letter it reads 비밀연애, but it actually sounds like [비밀려내] (bimil-lyeonae). It’s the same reason 서울역 (Seoul-yeok) comes out as [서울력] (Seoul-lyeok): when the first part ends in the final consonant ㄹ and the next part starts with 여, an ㄴ sound slips in between them and then, pulled along by the ㄹ, turns into another ㄹ. If you say [비밀연애] to a Korean, carefully separating each syllable, they’ll understand you — but it will sound stiff.

To use it as a verb, add 하다 (hada) to the end. You get 비밀연애하다 (bimil-yeonae-hada), in polite speech 비밀연애해요 (bimil-yeonae-haeyo), and more formally 비밀연애합니다 (bimil-yeonae-hamnida). That said, the word is about private matters by nature, so you’ll almost never have a reason to use it in a genuinely formal setting.

See It in a Real Conversation

Setting: Sunday evening at the apartment complex’s recycling area. Emily is throwing out a plastic bottle when she remembers something she saw at the front gate ten minutes ago.

Emily: 오빠, 아까 입구에서 같이 들어오던 사람 누구야? 손잡고 있던데. Hey, who was that coming in with you earlier? You two were holding hands.

Jun-kyung: …봤어? 아, 진짜. 야, 이거 회사에 말하면 안 돼. …You saw? Oh, seriously. Look, you can’t tell anyone at work.

Emily: 같은 팀 대리님이지? 어쩐지! 오빠 비밀연애 중이었구나. It’s the manager on your team, right? I knew it! So you’ve been dating in secret.

Jun-kyung: 쉿. 팀장님 귀에 들어가면 골치 아파. 딱 한 달만 더 비밀연애하기로 했어. Shh. If it reaches my team lead it’s a headache. We agreed to keep it secret just one more month.

Emily: 알았어, 입 꾹 다물게. 근데 오빠 요즘 왜 이렇게 표정이 좋나 했다. Fine, my lips are sealed. No wonder you’ve looked so cheerful lately.

Jun-kyung: 티 나? 큰일이네, 내일부터 무표정으로 다녀야겠다. Is it obvious? That’s bad. Guess I’ll have to keep a straight face starting tomorrow.

This Sounds Off

✗ (A team lead to a new hire at a company dinner) 김 사원, 요즘 비밀연애하나 봐? 얼굴이 아주 좋네. ✓ (Between close colleagues who started the same year) 야, 너 요즘 비밀연애하지? 얼굴이 좋아졌어. → It’s a guess about someone else’s love life, so when a senior tosses it out in front of a group, it stops being a joke and turns into pressure. The exact same words only land as teasing between peers, and only when it’s just the two of you.

✗ 그 사람 유부남인데 요즘 비밀연애 중이래. ✓ 그 사람 유부남인데 몰래 만나는 사람이 있대. → 비밀연애 is a relationship that’s above board but simply unannounced. Using it for a relationship that isn’t above board wraps the situation in something lighter and more romantic than it really is, and the listener walks away with the wrong idea.

Example Sentences by Situation

① The moment you start dating and agree not to tell anyone When you start seeing someone in your own department, people at Korean companies often discuss when to go public before anything else.

우리 당분간은 비밀연애로 가자. (uri dangbunganeun bimil-yeonaero gaja.) — Let’s keep this between us for a while.
프로젝트 끝날 때까지만. (peurojekteu kkeutnal ttaekkajiman.) — Just until the project wraps up.

② When you admit that hiding it is hard The most common complaint about a secret relationship isn’t the fear of getting caught — it’s that when something good happens, there’s nobody you can brag to.

비밀연애가 제일 힘든 건 축하받을 데가 없다는 거야. (bimil-yeonaega jeil himdeun geon chukhabadeul de-ga eopdaneun geoya.) — The hardest part of dating in secret is that there’s nowhere to go to be congratulated.

③ When you go public When you talk about the moment you go public, the word is used as an object, as in 비밀연애를 끝내다 (bimil-yeonaereul kkeutnaeda, to end the secret relationship) or 비밀연애를 청산하다 (bimil-yeonaereul cheongsanhada, to put an end to the secret relationship).

석 달 만에 비밀연애 끝냈어요. 어제 팀에 다 말했거든요. (seok dal mane bimil-yeonae kkeutnaesseoyo. eoje time da malhaetgeodeunyo.) — We ended our secret relationship after three months. I told the whole team yesterday.

Polite and Casual Forms, and Similar Expressions

For polite and casual speech, all you change is the 하다 (hada) on the end. To a friend it’s 비밀연애해? (bimil-yeonae-hae?), and somewhere that calls for politeness it’s 비밀연애하세요? (bimil-yeonae-haseyo?) — but you’re asking about someone’s private life, so being polite doesn’t automatically make it safe. Whether you’re close enough to ask at all comes before how you phrase it.

The expressions that look similar each point at slightly different things.

Expression	Tone & intensity	Where it’s used
비밀연애 (bimil-yeonae)	Neutral. Half flutter, half nerves	Talk among peers, dramas, entertainment news
몰래 만나다 (mollae mannada)	A little darker. Emphasizes the act of hiding	Describing a situation; also used for relationships that aren’t above board
공개연애 (gonggae-yeonae)	Bright and open. The opposite of 비밀연애	Entertainment news, talk among peers
사내연애 (sanae-yeonae)	Neutral. Says nothing about whether it’s hidden	Any conversation about work
썸 (sseom)	Light and uncertain. Not dating yet	Peers and social media; rarely used with someone senior

The trickiest pair in that table is 비밀연애 and 썸. 썸 is the ambiguous stage right before two people are actually together. 비밀연애 means they’re already a couple and simply haven’t told anyone. If you’re actually dating and you say 우리 썸 타는 중이야 (uri sseom taneun jung-iya), a Korean will hear it as “we’re not dating yet.”

사내연애 is worth a note too. 사내연애 only carries information about place — a romance inside the company — so it applies whether the couple is open about it or hiding it. That’s why the two words so often travel together in real conversation, and why 사내연애인데 비밀연애 중이야 (sanae-yeonaeinde bimil-yeonae jung-iya), “it’s an office romance, and we’re keeping it secret,” doesn’t sound redundant at all.

Cultural Background — Why Bother Hiding It?

The word itself is a very plain compound. 비밀 (祕密, secret) and 연애 (戀愛, romance) are simply stuck together, and since both are Sino-Korean, learners who know Chinese or Japanese can often guess the meaning from the characters alone. But there’s a reason this ordinary combination comes up so much in Korea.

The first reason is the workplace. At many Korean companies, people eat together as a department, go out for company dinners, and stay in touch even on weekends. In an organization like that, once word gets out that two people are dating, everything from work assignments to seating at the next company dinner becomes a topic. And if they break up, the aftermath is even more awkward. So the first thing people who start an office romance talk about is “when do we tell them,” and the stretch of time before that is precisely 비밀연애.

The second reason is the entertainment industry. Some Korean idol groups used to have clauses in their contracts restricting dating for the first few years after debut, and even now it’s common to delay going public because of how fans will react. That’s why phrases like 비밀연애 3년 끝에 공개 (bimil-yeonae 3-nyeon kkeute gonggae), “going public after three years of secret dating,” show up again and again in entertainment news — and why you’ll spot this word in headlines even more often than in everyday speech.

The third reason is a long-running formula in Korean dramas. Two people hiding an office romance who use polite speech with each other at work and switch to casual speech on the walk home; the scene where another employee steps into the elevator just before the doors close — these have been repeated countless times in Korean romance dramas. Some shows, like What’s Wrong with Secretary Kim (tvN, 2018), build a whole major storyline around hiding a relationship at the office. As those scenes piled up, 비밀연애 picked up an entire picture beyond its dictionary meaning — quiet hallways, leaving the building separately, the sound of your own heartbeat in the moment you almost got caught.

So when a Korean says this word, the look on their face usually isn’t a serious one. It’s less the face of someone hiding something bad, and more the face of someone carrying good news they haven’t told anybody yet.

Today’s Quiz

Emily said this to a coworker who joined the company the same year she did.

나 사실 6개월째 ○○○○ 중이야. 다음 주에 팀에 말하려고. Actually, I’ve been ○○○○ for six months now. I’m going to tell the team next week.

Which word belongs in ○○○○?

썸 (sseom)
비밀연애 (bimil-yeonae)
공개연애 (gonggae-yeonae)

Answer: 2. The line 다음 주에 팀에 말하려고 (“I’m going to tell the team next week”) reveals two things at once: she hasn’t told anyone so far, and she’s already in a relationship. Option 1, 썸, is the stage before you’re actually dating, so neither “for six months now” nor “I’m going to tell the team” fits it. Option 3, 공개연애, means the relationship is already out in the open, which runs head-on into the second sentence.

Definitions and example sentences are from the National Institute of Korean Language’s Basic Korean Dictionary (krdict.korean.go.kr); that portion of this post, including our translations, is licensed under CC BY-SA 2.0 KR.