Short answer: almost nobody in Korea unlocks their own front door with a metal key. Since the mid-2000s, the default in Korean housing has been the digital door lock (도어락, doeorak, literally “door” plus “lock”) — a keypad, fingerprint reader, or RFID fob sitting where a keyhole would normally be, opened with a 4-to-8-digit code that everyone in the household just… knows.
That last part is where things get complicated. My mother-in-law has our code, because she’s the one who can get here on short notice when daycare pickup falls through. Our babysitter has it. For about three weeks after we moved in, so did the moving company and the real-estate agent — nobody thought to change it, and I still remember the specific, low-grade dread of realizing that on a random Tuesday, mid-commute, for no particular reason.
When we signed the jeonse (전세, Korea’s lump-sum deposit lease, which I’ve written about elsewhere because it makes no sense the first time anyone explains it to you) on this apartment, the agent didn’t hand over a single key. She handed over a code, scrawled on a sticky note, and resetting it was the first thing I did once the movers left. These days the access list is smaller — mostly a delivery rider getting buzzed through the building’s lobby, not our actual front door — but the quiet accounting of who currently has a way into my home never fully stops running in the background.
How Common Are Digital Door Locks in Korea?
Korea’s household adoption of digital locks is genuinely one of the highest in the world. Multiple market surveys put overall penetration at 80%+ of Korean homes. Compare that to the US, Europe, and China, where household adoption of any digital lock is commonly reported in the single digits. A Zigbang survey of 500 Korean homeowners aged 30 to 59, published in early 2025, found that 87.4% said keypad or password entry — what Koreans call a beonho-ki (번호키, literally “number key”) — is their primary way of getting into their own front door.
Not a backup option.
The primary one.
Why Did Korea Get Rid of the Front-Door Key?
The shift wasn’t gradual so much as it was a hard cutover for anyone buying into a new building. Digital door locks became a near-universal fixture in newly constructed apartment complexes starting around 2006, not long after a company called Gateman released a 2005 line of fingerprint- and RF-card-capable models that pushed the technology from novelty to standard fixture almost overnight. From there, the same default spread outward through the 2010s to villas (빌라, borrowed from the English word but used in Korea for a small three-to-five-story multi-unit walk-up, not a detached estate) and officetels (오피스텔, a studio-style unit zoned for both residential and commercial use). At this point, a physical keyhole is something you’d mostly expect to find in a building nobody has renovated since before I was in college.
Who Actually Has the Code to My Door?
Here’s the actual roster, in my case, at any given time: my spouse and me, my mother-in-law, our babysitter, and — briefly, whenever we’ve had a repair scheduled — whoever the building manager sends up. Multiply that by every household in the country and you start to see why the Zigbang survey’s satisfaction numbers look the way they do. Keypad or password entry might be everyone’s default, but only 62.9% of the survey’s respondents said they were actually satisfied with it. 36.6% had already upgraded to an app- or Bluetooth-connected smart lock, and 63.1% of those not yet using one said they planned to upgrade eventually.
The reasons line up with exactly what you’d guess from a family that hands its door code to three different people in a given month. Among respondents who weren’t fully comfortable with plain password entry, 75.3% cited fear of the code leaking somehow, 44.4% cited fear of a hacking- or crime-related break-in, and 34% said the act of sharing the passcode with a visitor — a repair tech, a relative, a friend crashing for the weekend — made them uneasy in the moment.
| What Korean homeowners say about their door locks | Share |
|---|---|
| Primary entry method is keypad/password (beonho-ki) | 87.4% |
| Satisfied with password-only entry | 62.9% |
| Already use an app/Bluetooth smart lock | 36.6% |
| Not yet upgraded, but plan to eventually | 63.1% |
| — of the unsatisfied, fear the code will leak | 75.3% |
| — of the unsatisfied, fear a hacking-related break-in | 44.4% |
| — of the unsatisfied, uneasy sharing the code with visitors | 34% |
Source: Zigbang survey of 500 Korean homeowners aged 30–59, published March 2025.
Can Someone Actually Guess My Door Code?
According to an OhmyNews investigation that reviewed hundreds of court rulings, a neighbor in Geumcheon-gu — one of Seoul’s southwestern districts — spent about three weeks in 2020 quietly working out a resident’s door-lock code, timing the beeps the keypad makes with each digit, then reading the fingerprint smudges left behind on the most-used numbers. Once he’d narrowed it down, he broke in. Six separate times, across 2020 and 2021, including after the victim changed the code once already. He was eventually caught, convicted of trespassing, and given a suspended sentence by the Seoul Southern District Court.
I build systems for a living, which means the first thing I did after reading about that case was go check whether our own keypad has a decoy-digit feature — most newer models do, where you can tap a few meaningless extra numbers before or after the real code so a listener can’t just count the beeps. My spouse thought the whole exercise was a little much, which, if you’ve read anything else I’ve written about the two of us, will not surprise you at all. She’s probably right that the odds of it happening to any specific household are low. I’ve just never fully been able to unhear “someone could time the beeps.”
Is Korea Moving Past the Keypad?
The direction of travel is pretty clearly toward more connected, less shareable locks. Several market-research firms have tried to size how fast South Korea’s smart-lock market — meaning app- or Bluetooth-connected models, not the basic keypad-only kind — will grow, and their estimates disagree by as much as sevenfold depending on which firm you ask, which tells you the category is still too new for anyone to agree on a number. The more reliable signal is what those Zigbang respondents already told us: 36.6% of households have already made the switch to a smart lock, and 63.1% of everyone else say they plan to upgrade eventually. The appeal isn’t hard to understand. A smart lock can issue a temporary, expiring code for a babysitter instead of the permanent one, or log exactly when the door opened and by which method, instead of leaving you to just trust that everyone who has the four digits used them responsibly.
We haven’t upgraded yet.
Partly it’s inertia, and partly — this is the ISTJ talking — I don’t love the idea of a lock that depends on an app staying online. But I’ve started keeping a mental list of who currently has our code, which is basically a small, manual version of the thing a smart lock would log automatically. If you’re moving into a Korean apartment for the first time, my actual advice is boring: the code is yours the moment you get the keys to the building, so change it before anyone else does, and then just… keep track.