Four seemingly unremarkable cases follow one after another, all of which appear to be accidents and entanglements.
Trace inspection policeman Lu Xun firmly believes that traces will never deceive others, and he and his wife Wan Li stay together in this world.
The disguise of the murder was so perfect that the murderer was even hidden among the law enforcers.
He used no physical evidence to break through numerous mysteries and expose carefully arranged crimes. While chasing the darkness, he lived happily at the same time.
Calm detective Lu Xun × cute sweet girl Wan Li
Intention: Obsession is a shackle, but light can eventually be expected
