In Hechang City, Zhongchang Province in the 1990s, Qin Chuan, a grassroots policeman, finally became a criminal police officer through his own hard work and further studies. After the heroic sacrifices of his master Gao Jianshe and his friend Ye Maosheng, Qin Chuan strengthened his determination to defend justice and punish criminals. He participated in the detection of many cases and gradually grew into an outstanding representative of Zhongchang's criminal investigation team. The criminal investigation industry needs to train new people. Cao Zhongshu, a criminal technical expert specially invited by the Zhongchang Provincial Public Security Department, was impressed by Qin Chuan's talent and concentration. Wu Yingde, the chief criminal investigation expert, accepted Qin Chuan as his apprentice after a rigorous inspection.
