A series of disappearances and fatalities occur one after another near the Korean Demilitarized Zone. In response, South Korea assembles a special team under the command of Captain Jo Jin-Ho, with First Lieutenant Shin Yoo-Hwa serving as his deputy. The team is tasked with uncovering the truth behind these events within a tight deadline of 24 hours. Although they gather clues, the team senses that something is amiss.