Detective Ko Gun-soo is driving home from his domineering mother's funeral when he accidentally hits and kills a man on a deserted road. Panicked and desperate to hide his involvement, he stows the body in his car trunk. As the night progresses, Ko finds himself in a harrowing situation, needing to conceal his crime from fellow police officers investigating the same hit-and-run case, while grappling with his conscience and the fear of being caught. His attempts to evade suspicion involve hiding the corpse in a place that could raise fewer questions—a decision that sets off a chain of events, unraveling dire consequences.

Ko's troubles escalate further when he learns that the victim had been connected to shady dealings, drawing the attention of his dogged colleague Park Chang-min. In parallel, an internal investigation into Ko’s ethics and conduct at work adds intense pressure. As layers of corruption, conspiracy, and brutality unfold, Ko struggles to stay one step ahead of his colleagues and enemies, battling against a tightening web of deception and betrayal. With every move he makes to protect himself and his family, the stakes grow higher, plunging him deeper into a perilous situation where trust is scarce and danger is omnipresent.