Qin Chi, the deputy of the Xi Guan, the only survivor of the "gun case", continued to fight against amnesia after the heavy blow, and solved the story of the "gun case" while cracking the suspect. The role of Qin Chi, a thoughtful, not only has to solve the "mystery" behind the complicated cases with the police colleagues, but he also has more emphasis on the puzzles to be solved, the tough color and suspense.