Build a movie plot around this: What happens when Woo-jin draws his gun? Sung-shik shoots him
Two North Korean soldiers are killed in the DMZ at a North Korean border house, before Sergeant Lee Soo-hyeok (Lee Byung-hun), a South Korean soldier on border duties, attempts to flee back to the South Korean side. The southern troops rescue him while the gunfire erupts and, two days later, the fragile relationship between the two Koreas depends on a special investigation conducted by Swiss Army Major Sophie E. Jean (Lee Young-ae) on behalf of the Neutral Nations Supervisory Commission.As Sergeant Lee Soo-hyeok has confessed to the shootings, Sophie investigates why the two Koreas have contradicting accounts of events; Soo-hyeok's states he was knocked out and kidnapped while relieving himself and, waking tied up in the North Korean border house, secretly freed himself and shot three North Korean soldiers, leaving two dead. The North Korean survivor Sergeant Oh Kyeong-pil (Song Kang-ho) states that Soo-hyeok barged into the border house and shot everyone before retreating when the wounded Kyeong-pil returned fire.The autopsy report shows that one NK soldier, Jeong Woo-jin (Shin Ha-kyun), was shot eight times repeatedly, indicating a grudge was held; additionally, a single bullet is not accounted for. Over the course of the investigation, witness Private First Class Nam Sung-shik (Kim Tae-woo) attempts suicide by jumping out of the window of the interrogation room and a strange emotional reaction between Kyeong-pil and Soo-hyeok during a meeting causes Sophie to confirm her suspicions that the surviving soldiers and Woo-jin held a mutual friendship and were attempting to protect one another.Explained through flashbacks it is shown that Soo-hyeok was on patrol with other soldiers, only to get lost on the North Korean side and to partially trip a mine. Found by Kyeong-pil and Woo-jin, the two North Koreans deactivate the mine, which later prompts Soo-hyeok to throw written messages over the border to maintain contact with his two new friends. Eventually inviting Soo-hyeok across the border, the three become a...