In the midst of the Korean War, a team of South Korean spies goes behind enemy lines to steal a map of North Korean coastal defenses. Their mission, codenamed "Operation Chromite," is crucial to the success of a major amphibious invasion planned by General Douglas MacArthur. The team, led by Captain Jang Hak-Soo, must infiltrate the North Korean command center in Incheon and gather information on the placement of mines and artillery, as well as the tactical characteristics of the harbor. With Limited time and resources, the team must navigate through dangerous waters and avoid detection by the North Korean authorities, led by the suspicious commander Lim Gye-Jin. The outcome of the mission will determine the fate of the war and the future of Korea.

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Some movies that have similar genres and were produced around the same time as Operation Chromite include 1917, 13 Hours: The Secret Soldiers of Benghazi, Escape From Sobibor, 15 Minutes of War, The Admiral: Roaring Currents, 12 Strong.