Homicide detective Geon-soo Go is having a hard day: in less than 24 hours, he receives a divorce notice from his wife, his mother passes away, and along with his coworkers, he becomes the focus of a police investigation over alleged embezzlement.
Making things worse, on his way to his mother's funeral, Geon-soo commits a fatal hit and run and then, desperately tries to hide the accident by hiding the man's corpse in his deceased mother's coffin. But when Geon-soo gets a mysterious call from a person claiming to be the sole witness of the crime, he realizes that someone has been watching him all along.
