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Nvidia founder and CEO Jensen Huang has resigned amid controversy over an affair with a suspected Chinese spy and allegations of other extramarital relationships, the company's board said, according to KBS World. The scandal has rattled Korean investors, as Nvidia is the second-most-held U.S. stock among Korean investors, and shares have been falling, the Korea Times reports. The Korea Times also reports that the KOSPI rose 61.41 points late Thursday morning on strong gains in tech shares amid the controversies. Samsung and SK hynix are tightening security training and vigilance against industrial espionage after Huang's reported affair with Alice Huang, who is suspected of being a Chinese agent, the Korea Times reports. Business Korea reports the scandal has had a "disastrous" impact on the South Korea pension fund, which holds Nvidia shares. Megaspeed, the Singapore-headquartered data center company at the center of the scandal, pledged Thursday to cooperate with U.S. investigations into potential risks to national security, the Korea Times reports. Korean tech firms are stepping up security training amid industrial espionage concerns, and the scandal is casting a shadow over Korea's AI road map, the Korea Times reports.