Di Renjie, Bao Zheng, and Song Ci were famous politicians, officials, and case-solving experts in real history. Di Renjie was an outstanding politician and official in the Tang Dynasty. He had once held important positions such as prime minister. With his outstanding political talent and wisdom, he successfully handled many cases and became one of the famous case-solving experts in the Tang Dynasty. Bao Zheng was a famous politician and official in the Song Dynasty. He had served as the prime minister and privy envoy of the Song Dynasty. He had made outstanding achievements in politics, military, law and many other fields, especially in handling cases. Bao Zheng became one of the famous case-solving experts in the Song Dynasty with his incorruptible and impartial spirit of law enforcement. Song Ci was a famous scientist and mathematician during the Ming Dynasty. He became one of the famous case-solving experts during the Ming Dynasty with his outstanding mathematical and physics talents. He often used mathematics and physics knowledge to analyze and reason in handling cases and achieved many amazing results.