Lin Bei, an ordinary young man with the ability of "causal tracing" can see the marks of sin on anyone. When he met a mysterious neighbor who had just moved in in an old community, he found that this seemingly gentle man was covered in bloody traces of crime. What's even more frightening is that the other party can actually sense Lin Bei's prying eyes.
From then on, Lin Bei's life was involved in a strange cat-and-mouse game. The neighbors pressed forward step by step, using various unexpected methods to test, threaten, and control, trying to uncover Lin Bei's secret. Lin Bei discovered that behind this neighbor, there was an underground criminal network that had been entrenched in the city for decades.
In order to protect the ordinary people around him, Lin Bei had to use his abilities to confront evil again and again in this dark alley. But he soon realized that some enemies could not be defeated by ability, and some truths were far darker than imagined. When all the clues pointed to an unsolved case twenty years ago, Lin Bei discovered that he had already been a pawn in this chess game...
