Jungonara Scam Prevention: Korea's Triangle Fraud and How to Stay Safe

South Korea's secondhand marketplace ecosystem — led by platforms like Jungonara (중고나라), Danggeun Market (당근마켓), and Bungaejangter (번개장터) — is massive. But so is the fraud. Over 80,000 scam cases are reported annually, with total damages exceeding 137.3 billion KRW (approximately $100 million USD).

What makes Korean marketplace fraud particularly insidious is a uniquely Korean scam type called 삼자사기 (samja-sagi), or "triangle scam," where the scammer manipulates two innocent parties into becoming both victim and unwitting accomplice.

How the Triangle Scam (삼자사기) Works

This scam is devastatingly clever because both the buyer and a separate seller become victims.

The Mechanism

Step	Scammer's Action	Victim
Step 1	Lists an item for sale (Item X) at an attractive price	Buyer C expresses interest
Step 2	Separately contacts legitimate Seller B to buy the same item	Seller B thinks it's a normal transaction
Step 3	Gives Seller B's bank account to Buyer C for payment	Buyer C transfers money to Seller B's account
Step 4	Receives the item from Seller B and disappears	Buyer C never receives anything; Seller B gets reported as a scammer

The result: Buyer C loses their money. Seller B unknowingly acted as a "mule account" and gets flagged by police. The scammer walks away with both the item and the money.

This scam is particularly common in Korea because bank transfers are the default payment method for person-to-person transactions, and the intermediary nature of the fraud makes it difficult to trace.

5 Common Scam Types on Korean Marketplaces

1. Fake Safe Payment (안전결제 사칭)

Scammers send phishing links disguised as official Naver Pay or Jungonara safe payment pages. These fake sites look nearly identical to the real ones but steal your card information.

How to spot it: Always check the URL. Official domains are pay.naver.com and joonggonara.co.kr. Anything else is a scam.

2. Fake Shipping Tracking

The seller provides a tracking number but never actually ships your item. The tracking might show "in transit" because the scammer sent an empty box or shipped to a different address entirely.

3. Post-Meetup Refund Scams

After a successful in-person exchange, the buyer contacts you claiming the item is defective and demands a refund — often after swapping it with a broken version.

4. Too-Good-to-Be-True Pricing

Items listed at 50-70% below market value with urgent reasons: "Moving abroad," "Military service soon," or "Company liquidation."

5. Personal Information Harvesting

Requests for your resident registration number (주민등록번호), bank account copies, or other personal details under the guise of "needing it for shipping." This information is used for identity theft and creating mule accounts.

How to Verify Before You Buy

TheCheat (더치트) - Korea's Scam Database

Before any transaction, check the seller's account number and phone number on TheCheat:

1. Visit thecheat.co.kr
2. Enter the seller's bank account number or phone number
3. Check for any fraud reports

Jungonara's Built-in Fraud Checker

The Jungonara app provides a scam lookup service that lets you search by account number, phone number, or username to see if they've been previously reported.

National Police Cyber Bureau

Korea's Cyber Investigation Bureau at cyber.go.kr also maintains records of reported fraud cases.

7 Rules for Safe Transactions

Rule	How to Apply
Use escrow payment	Always use the platform's built-in safe payment (에스크로) system
Meet in safe locations	Police station lobbies, CCTV-covered public areas
Check accounts	Verify the seller's account on TheCheat before sending money
Verify pricing	Be suspicious of prices significantly below market value
Check seller history	Review the seller's transaction history and ratings
Limit personal info	Only share the minimum information needed for shipping
Save evidence	Screenshot all conversations, transaction records, and listings

Sharing Transaction Links Safely

When sharing product information or payment links during secondhand transactions, security matters. LOCK.PUB lets you create password-protected links that only your intended transaction partner can access. This adds an extra layer of security against triangle scams, where third parties intercept transaction details.

What to Do If You've Been Scammed

Immediate Steps

1. File a police report: Call 112 or report online at cyber.go.kr
2. Request account freeze: Call your bank's hotline to freeze the receiving account immediately
3. Preserve evidence: Save all chat logs, listing screenshots, and transfer records
4. Report on TheCheat: Submit the scam account to thecheat.co.kr

Refund Chances

The faster you act, the better your chances. Requesting an account freeze within 30 minutes of the transfer significantly increases the possibility of recovering your funds.

Conclusion

With over 80,000 reported cases annually, secondhand marketplace scams in Korea are a serious threat. But basic verification steps — checking TheCheat, using safe payment, meeting in public places — can prevent most fraud.

When sharing sensitive transaction details or links, use LOCK.PUB to password-protect them. A small precaution can prevent a big loss.