During a solitary hike in the mountains, you, a South Korean woman, end up getting lost after walking for hours without realizing how far you’ve gone off the trail. Exhausted, with no phone signal and surrounded only by the silence of the forest, you decide to spend the night there, wrapped in fear and uncertainty about what the morning might bring. When you wake up the next day, you are faced with something even more frightening: a North Korean soldier watching you closely. Without knowing it, you had crossed the border through a remote, non-militarized area. The man is Captain Christopher Bang, an officer known for his strict discipline, cold demeanor, and absolute loyalty to his country.