Former TSMC Engineer Arrested in Taiwan Over Alleged Underground Currency Exchange Network
Taiwanese authorities have arrested a former TSMC engineer accused of operating an illegal currency exchange and money laundering network that moved funds between Taiwan and South Korea. The case has drawn attention not only because of the suspect’s past role at one of the world’s most important semiconductor manufacturers, but also because investigators say the operation blended logistics, apparel imports, cryptocurrency transfers, and black-market exchange rates.
The suspect, identified by local authorities as Chang, reportedly left TSMC due to health-related issues before becoming involved in the underground financial operation. Investigators began looking into the network in February after receiving information about a logistics company suspected of helping move money and goods between Taiwan and South Korea outside official banking channels.
According to police, the alleged network had been operating since 2018 and mainly served Taiwanese apparel businesses that purchased products from South Korean suppliers. Instead of using formal banking systems to pay exporters, these businesses allegedly made payments to the underground exchange network in Taiwan. The network would then handle the settlement in South Korea, allowing the transactions to bypass regulated financial channels.
Authorities say the logistics company acted as the front for the operation. In addition to facilitating payments, the group allegedly helped handle shipping fees and transport goods from South Korea to Taiwan. Investigators believe profits were generated through differences between official exchange rates and black-market currency rates, which are often less favorable to customers but profitable for illegal exchange operators. Police said those profits were shared with the logistics firm involved in the scheme.
The operation was not limited to traditional cash-based transfers. Investigators also found that the group allegedly used cryptocurrency to move funds and obscure transaction trails. Money was reportedly transferred to a domestic cryptocurrency exchange before being moved to South Korea through international crypto platforms and personal cold wallets. Police believe this layered approach was designed to make the money flow harder to trace and to slow down investigators.
Chang’s technical background may have played a role in how the network was managed. Authorities said the former engineer used his analytical skills to create profit calculation formulas and study exchange-rate movements in order to increase gains from the operation. This detail has made the case especially notable, as it shows how technical and financial knowledge can be applied to underground financial systems.
Taiwanese police carried out enforcement actions in three separate waves on July 14, July 22, and July 29 across multiple districts. In total, investigators conducted 14 searches and arrested Chang along with 11 alleged accomplices.
During the raids, authorities seized NT$2.55 million in cash, 1,078 Tether tokens, 1.71 million Korean won, and additional foreign assets valued at around NT$1.03 million. Police also confiscated luxury items, including three Piguet watches, a Rolex watch, and a Tesla Model S Plaid.
After his arrest, Chang was released on NT$500,000 bail as the investigation continues.
The case highlights growing concerns in Taiwan over underground currency exchange networks, cross-border money laundering, and the use of cryptocurrency to disguise financial flows. It also shows how illegal exchange systems can become deeply connected with everyday commercial activity, including apparel imports and logistics services.
Authorities are expected to continue examining the full scale of the network, including the companies that allegedly used its services and the role of digital assets in moving money between Taiwan and South Korea.
