The Spy Gone North (2018)

"In the mid-1990s, an intelligence agent from South Korea's "National Security Planning Department" with the code name "Black Venus" pretended to be a South Korean businessman to conduct commercial transactions with North Korea, thereby infiltrating North Korean military units and gathering intelligence on nuclear development. He had to be in the most dangerous place, Winning the enemy's trust, he didn't expect that he only wanted to complete the mission..."