GP506 (2008)

This is a Korean military mystery thriller film directed by Kong Soo-chang, released in 2008. A massacre occurs at GP506, a forward outpost within the Demilitarized Zone (DMZ), where 20 out of 21 soldiers are killed, and one is found in a comatose state. The military leadership, attempting to cover up the incident, dispatches top investigator Sergeant Major Noh Sung-gyu (Cheon Ho-jin) to secretly conclude the investigation within a limited time. While searching the scene, Sergeant Major Noh discovers the sole survivor among the bodies, Lieutenant Yoo Jeong-woo (Jo Hyun-jae), the platoon leader and son of the Army Chief of Staff. However, Lieutenant Yoo refuses to make a statement and exhibits suspicious behavior, leading Sergeant Major Noh to begin tracing the incident back through the past records (diaries and camcorder footage) of the surviving soldiers. The story features a multitude of human characters, including those involved in the massacre at the GP, an even more closed-off space within the already closed-off military, those trying to bury the incident, those trying to uncover it, and those desperately struggling to survive. It's a well-made horror film that doesn't fall short compared to its predecessor.