A single cross-border laundering method has quietly become the backbone of South Korea’s crypto crime wave, accounting for $6.4 billion of the $7.1 billion in illegal crypto transactions recorded in the country since 2021. And despite knowing exactly how it works, police are struggling to stop it.

The technique is called Hwanchigi. It exploits cryptocurrency transfers to move illicit money offshore without touching South Korea’s regulated banking system, making it fast, borderless, and difficult to prosecute. A Crystal Intelligence report tied the method to the vast majority of illegal crypto flows in the country between 2021 and August 2025, and new police data suggests its use is accelerating sharply.

The Numbers Behind the Surge in Korea

National Police Agency figures show money laundering cases involving virtual assets hit 1,214 in the first half of 2026 alone, up from just eight cases in all of 2025. That 152-fold jump pushed money laundering to 79.4% of all crypto offenses detected in H1 2026, displacing investment fraud, which had accounted for 92% of crypto crime through last year.

South Korea’s crackdown on illegal crypto transactions has intensified in recent years, but the case data shows criminal networks are scaling faster than enforcement.

The preferred vehicle is Tether (USDT). Stablecoins now dominate illicit crypto flows globally, and South Korea’s criminals use them to convert drug trafficking proceeds, gambling revenue, and phishing profits into dollars before routing funds through overseas exchanges beyond domestic jurisdiction.

Detection Without Consequence

The enforcement gap is stark. Police made only 18 arrests for crypto money laundering in H1 2026, compared to 42 in 2023, despite detecting nearly 100 times more cases.

The pattern repeats across recent high-profile operations: in June 2026, Seoul Metro Police charged 23 individuals over a laundering network tied to a Cambodia-based phishing group and confiscated $431,000 in proceeds, but the alleged ringleader remains at large under an Interpol Red Notice.

In July 2026, investigators traced and froze $12 million in XRP and Tether after a fake Flare Network staking site drained $8.6 million from 71 investors, but arrests lagged the asset freezes.

The Korea Customs Service seized 7.2 trillion won ($4.92 billion) in illegal foreign exchange transactions in H1 2026, including export companies that accepted crypto to bypass repatriation rules. Over 90% of the 9.5 trillion won in crypto-linked crime referred for prosecution ran through unlicensed channels, not regulated banks.

South Korea can map the money. Following it to a courtroom is a different problem entirely.

Source: BeInCrypto