Pei Yu, a sloppy young man who lives by talking nonsense, actually has super reasoning ability, but he always pretends to be ignorant of the world. Three years ago, he was stabbed in the back by his friend Chen Xiao and accidentally lost his memory. When he woke up, there was a five-year-old cute baby named Pei Xiaosuan next to him, who claimed to be his son and had amazing mathematical talent and insight. Pei Yu found that he had obtained a golden finger - "causal deduction", which can reversely deduce the truth from fragmented information. In order to find out the truth, he took his son into a whirlpool of wits involving tens of billions of inheritance. On the surface, he is laughing and talking, but secretly he is setting up traps. When all the evidence pointed to Chen Xiao, Pei Yu mistakenly believed that his son was not his biological son due to a misunderstanding. He broke down and confessed to his son affectionately: "No matter whether you are related to me by blood or not, you are my life, Pei Yu." In the end, the truth was revealed. Father and son teamed up to use their brains to trick the villain into doubting his life.
