Loosely based on true events, Suk-young Park (Jung-min Hwang) gets recruited by South Korea’s National Intelligence Service in the early 1990s to spy on North Korea’s nuclear programme. He creates a cover for himself as a highly indebted business man who will do anything for money. His mission is first to get close to the director of the North Korean Economic Council Myong-un Ri (Sing-min Lee), who has Kim Jong-Il’s trust. Park patiently works to build his credibility and finally gets closer to Ri, after which the true spy games begin.