The Spy Gone North

Gongjak is a movie starring Jung-min Hwang, Sung-min Lee, and Cho Jin-woong. In the mid-1990s, a loyal South Korean secret agent is caught in a political vortex plotted by the ruling classes of North and South Korea.
South Korea, 1993. An agent of the National Intelligence Service is sent to Beijing to infiltrate a group of North Korean officials with the ultimate goal of obtaining information about their nuclear program.