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After his girlfriend, who was also a criminal police officer, passed away, Tang Chao sadly resigned and became a private detective. Invited by his old classmate and colleague Gu Cheng, he participated in solving the death case of a female student in school. He met Gu Yihuan, a detective enthusiast, and began to solve strange cases one after another...

I was assigned to the women's prison. I originally wanted to stay there for a while before looking for opportunities to develop, but I never expected that I would meet him there. . .