The Front Line (Go-ji-jeon)

Amid a tense ceasefire at the end of the Korean War, the seizure of the strategic Aerok hill sparked intense fighting between North and South Korea. Lieutenant Kang Eun-Pyo is sent to investigate the mysterious death of a commander who was killed by a bullet from his own troops. On the front lines, he is surprised to find his old friend, Kim Soo-Hyeok—who was thought to be dead—now leading troops in an unusual way: enemy uniforms worn to survive the cold, a 20-year-old captain, and a dark secret lurking behind the ceasefire. Time is ticking, and soldiers' lives are at stake. Who is the real traitor?