Nine-year-old detective Wu Nan is paying for his past sins in this life. Relying on his extraordinary reasoning skills, he solved a murder case in the neighborhood and uncovered a case within a case, shocking the police station. Facing the 1213 unsolved case, he withstood the pressure and directed the major crime unit, cracking it in several days. Although he was reported, he won over the entire audience with his brilliant reasoning, earning himself the reputation of the "Nine-Year-Old Detective".

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