One day in September 2024, Ding Xiaohu - a 68-year-old resident of Mainland China - was standing outside the Sunworld Dynasty Hotel in Taipei, nonchalantly discussing his plans to contact several Taiwanese military officers with a friend in the lobby.
Unbeknownst to him, a pair of agents from Taiwan's Investigation Bureau posing as a nearby couple were secretly recording the conversation as part of a covert operation. A team of officers, cars, and motorcycles stood on standby nearby, monitoring the situation.
Ding's conversation was quickly relayed to the Investigation Bureau General Director, Michael Chen, a well-respected career agent with a background in national security. Chen immediately mobilized officers from across the bureau to start a full-on investigation into Ding.
Ding Targets Taiwan's Semiconductor Industry
A task force later charged with tracing all of Ding's previous movement in Taiwan discovered that he had been visiting Taiwan every two to three months for over a decade under the guise of religious or business exchanges.
Task force members disclosed that theHong Kong-born Ding adopted various titles and positions in Chinese trade and cultural organizations to disguise his spy activities in Taiwan as religious or business exchanges.
Ding's earlier movements had not caught the attention of national security officials, but his interest in Taiwanese semiconductor giant TSMC and alleged frequent interactions with the company's employees triggered an investigation.
According to sources, Ding's extensive interactions in Changsha with Taiwanese businessmen led to his introduction to a TSMC technician identified as Chen, with over 20 years at the company, who was deceived into sharing sensitive information.
Chen was knowledgeable about critical technologies such as transistors, making his recruitment a significant security concern.
Intelligence Leaks within the Military
After targeting Chen, Ding persuaded him to leave TSMC and establish a new business venture, with Ding providing funding and Chen supplying technical expertise, planning to set up a company in Hong Kong or Macau before returning to Taiwan. Convinced by Ding,Chen began recruiting covertly within TSMC and smuggling out technical documents, prompting alarm within the Investigation Bureau.
The bureau initially saw Ding's case as potential industrial espionage, suspecting him of poaching talent and critical technology from Taiwan's lucrative semiconductor industry.
But Ding's secret taped hotel conversation in September 2024 startled the surveillance team into thinking the case might be a full-scale espionage operation involving military informants.
Further investigation revealed that Ding had indeed also recruited two retired Taiwanese lieutenant colonels willing to help with espionage, each of whom later introduced him to several other local informants, including an active duty sergeant major in a Taiwanese armored unit.
The Investigation Bureau concluded the investigation by determining that Ding had engaged in intelligence activities in Taiwan under orders from Beijing, with the Taiwanese military personnel determined to be working as accomplices in espionage.
Official prosecutors apprehended Ding and seven Taiwanese military personnel in late July 2025. Ding and six others were charged with espionage-related crimes under Taiwan's National Security Act on November 18, 2025.
Ding's indictment marks the first phase of a comprehensive legal case, though his years of traveling in Taiwan suggest a broader espionage network yet to be fully uncovered.
Taiwan's national security establishment has leveraged Ding's prosecution to counter recent aggressive propaganda efforts by China, such as a highly publicized investigation into Taiwanese legislator Puma Shen.
