#202 2022 · Korean National Police Agency (with Cheil Worldwide) · Public safety
Korean National Police Agency, watching domestic-violence reports fall even as the underlying cases didn't, let victims trapped with their abuser answer the emergency line with two taps instead of a voice
the problem
Domestic-violence victims can't safely speak when calling for help
background
South Korea's emergency line 112 works like any other: a caller talks, a dispatcher listens, help is routed. But the Korean National Police Agency's own reporting showed domestic-violence cases reported through the line falling even as the underlying problem didn't. The read: many victims were confined in the same room as their abuser and simply couldn't talk into a phone without being heard — the call itself was the danger.
Cheil Worldwide, working with KNPA's 112 situation-room staff, redesigned the interaction rather than the messaging around it. Launched in September 2022 and rolled out to thousands of call handlers nationwide, the fix required no app install and no spoken word: a caller in trouble only had to reach the keypad.
what everyone would do
Run more awareness campaigns urging victims to call the emergency line. It fails because the barrier was never awareness that a hotline existed, it was that speaking into a phone in the same room as an abuser is itself dangerous — encouraging more calls does nothing for someone who physically cannot speak without being caught.
what they saw
The emergency line was built around the assumption that a caller could safely speak, which is exactly the assumption that fails for a trapped victim. The fix was recognizing that signaling distress and communicating the details of it don't have to happen through the same channel — a victim needs the smallest, most deniable possible action to trigger help, and everything else (location, context, conversation) can transfer silently afterward through a separate channel.
the move
After dialing 112 and giving no verbal response, a caller taps any number key twice — inspired by a knock, or Morse code. The call handler reads the double-tap as a distress signal and sends a text link back: opening it silently shares live location and camera feed with the officer, and opens a chat window disguised as a search-engine page so the caller can type without an abuser recognizing it as a police channel.
why it works
A double-tap on the keypad requires no words and is easily explained away as an accidental misdial if the abuser notices, so it carries almost none of the risk a spoken word would. That minimal signal is enough for a trained call handler to recognize as a distress code and respond by sending a text link disguised as an ordinary search page — something that doesn't look suspicious even if glanced at by the abuser. Opening it silently transmits live location and camera feed, giving police the operational information a full verbal call would have provided, all without the victim ever having to speak or type anything visibly identifiable as a call for help. The high-bandwidth transfer of real information happens entirely through channels that never require an audible or overtly obvious police interaction, closing exactly the gap that was suppressing reports.
the payoff
In the first month after the September 2022 launch, the system reportedly sent 5,749 links to silent callers. South Korea subsequently made the double-tap gesture an official part of the 112 protocol, and the campaign won the Glass: The Lion for Change Grand Prix at Cannes Lions 2023. Beyond that first-month count and individually reported rescues, there is no public multi-year usage or case-resolution dataset — the strongest verifiable claims are the launch-month figure, the formal protocol adoption, and the award record; broader long-run impact is not independently documented.
where it breaks
The mechanism depends on the victim having at least a few seconds of unwatched access to a phone screen — if the abuser is watching directly or no device is accessible at all, there's no opening for the signal to work. It also depends on call handlers being consistently trained to recognize the tap and respond correctly; a signal this minimal is easy to miss or dismiss as an accidental dial without disciplined, maintained protocol. And it requires the disguised link to stay genuinely convincing — if the disguise becomes widely known, including to abusers, its cover is gone and the entire safety mechanism depends on that secrecy holding.
what came after
The tap gesture is now standing national emergency-call protocol in South Korea, not just an ad campaign — call handlers are trained on it as routine procedure, and it continues to be cited in police press cases years after launch.
references
- [1]Cannes 2023 Glass Lion Grand Prix: 'Knock Knock' silent domestic violence campaign from Cheil WorldwideAd Age, 2023adage.com
- [2]Quick-thinking South Korean police officer rescues woman after silent 112 call for helpSouth China Morning Post, 2025scmp.com