South Korean police have broken up a USDT-based laundering ring that allegedly funneled roughly 16.8 billion won (about $11.1 million) on behalf of a Cambodia-based phishing syndicate — part of a wider crackdown on crypto-enabled crime in the country.
What happened
- The Seoul Metropolitan Police Agency’s criminal investigative division has referred 23 suspects to prosecutors, charging them with violations of the Foreign Exchange Transactions Act and the Act on Reporting and Using Specified Financial Transaction Information. Two alleged key operators, identified only as A and B, were arrested and detained.
- Investigators say the group purchased Tether (USDT), shuttled assets across domestic and overseas exchanges, and executed illicit foreign-exchange conversions under instructions from a suspected ringleader known as C. The activity is said to have taken place between February 2024 and April 2025.
- Police reviewed more than 11,300 accounts tied to the operation and uncovered 265 cases of voice-phishing and investment fraud, with estimated losses of about 25.7 billion won (roughly $17 million). Many accounts were used to layer and disguise proceeds before money entered the legitimate financial system.
- Authorities have secured pre-indictment seizure and forfeiture preservation orders covering about 650 million won (≈ $430,000) in suspected proceeds. The alleged organizer C remains at large and is being sought under an Interpol Red Notice.
Related arrests: illegal exchange services
- In a separate strand of the probe, police arrested 33 people accused of running unlawful currency-exchange services using crypto. These suspects reportedly took commissions from foreign tourists and acquaintances, bought USDT via multiple exchanges, moved funds across platforms, and converted them back into foreign currency or Korean won. Police estimate these transactions involved about 6.3 billion won (≈ $4.2 million).
- Officials warned that conducting crypto transactions or converting digital assets into fiat for third parties can be criminally punishable under South Korean law.
Wider enforcement context
- The case comes amid expanded enforcement against crypto-related financial crime in South Korea. Blockchain analytics firm Chainalysis recently signed a cooperation agreement with the Korean National Police Agency to provide investigator training, certifications, and practical exercises focused on virtual asset crimes such as fraud, money laundering, and cross-border theft.
- Authorities have also formed a dedicated task force targeting crypto money laundering, with investigators prioritizing unregistered exchange operators and fund movements through stablecoins like USDT.
- Enforcement activity has spilled into other high-profile probes: police recently searched Bithumb’s offices in an inquiry connected to allegations that lawmaker Kim Byung-gi used political influence to secure employment at crypto firms for his son.
Why it matters
- The case illustrates how stablecoins and cross-exchange transfers can be used to obscure criminal proceeds and underscores intensified cooperation between law enforcement and blockchain analytics firms. It also highlights growing legal risk for anyone who conducts crypto transactions on behalf of others without proper licensing or reporting.
Authorities continue searching for the fugitive ringleader and are pursuing legal action against the arrested suspects as the investigations proceed.
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