Detective Go Geon-soo is having a hard day, and the following events happen to him in less than 24 hours: He receives a divorce notice from his wife. His mother passes away. He and his coworkers are investigated by police inspectors over alleged embezzlement. Then on his way to his mother's funeral, he drives recklessly and commits a fatal hit and run. He tries to cover-up the accident by hiding the man's corpse in his deceased mother's coffin. But someone has been watching all along, and Geon-soo gets a mysterious call from a person claiming that he was the sole witness to the crime, who now begins to threaten him.After trying to cover up a car accident that left a man dead, a crooked homicide detective is stalked by a mysterious man claiming to have witnessed the event.