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A talented young man wanted to see justice, but due to family changes, he failed in the college entrance examination. From then on, he had no interest in going to school anymore and chose to work to make money. He thought that his whole life would pass by like this. But one day, he unexpectedly saved an old man who had suffered a sudden cardiac arrest. This old man was Cao Deqing, the famous old professor of the police academy in S City. Under the guidance of Professor Cao, Si Jianyi studied criminology and psychology on his own. His talent for solving crimes became more and more apparent, and he gradually formed his own method of solving crimes - using his super brain to converse with the deceased's appearance, and using the existing evidence to infer the murderer's behavior and psychology. After solving one case after another, Si Jianyi became more and more aware of how ridiculous it was to say that there is no proof until the dead. He would use his own way to make the dead speak and let the dead testify!!!