Ryu Seung-soo

In February 1951, while the armistice negotiation faced difficulties in Korea, the battle continues on the Eastern front line on the Aero K. A company commander of the South Korean army died in action, and the bullet found in his body belonged to the South Korean military. Lieutenant of the Defense Security Command Kang Eun-pyo (Shin Ha-kyun) is sent to the Eastern front line to investigate if this is related to any collaboration with the enemy. In the Aero K. Eun-pyo meets his old friend, Kim Su-hyeok (Ko Soo), whom Eun-pyo thought was dead. Once a soft-hearted student, Su-hyeok was promoted