A perfect murder occurs downtown, and all evidence points to a long-dead victim.
When a mathematical conjecture becomes a prediction of murder, logic expert Shen Yu'an is forced to form an alliance with theoretical genius Xie Tunan. They tracked down the real culprit, only to discover that their existence was the final proof of the perfect crime.
Purpose: At the end of absolute rationality, to defend "existence" that cannot be logically deduced