Li Feng, a very ordinary name, is already thirty-three years old today. He is a glorious policeman working in a prefecture-level city. He is mainly responsible for criminal investigation technology and psychology. Li Feng's work is often to investigate the scene and criminal portraits, etc. Sometimes he needs to judge the criminal's personality and general physical characteristics based on the crime process of the criminal. This is a very advanced discipline and very brain-burning. Therefore, Li Feng just turned 33 this year and his hair is half white. Li Feng has to dye his hair frequently. There is no way. He has not gotten married yet. He thinks that Li Feng is already middle-aged.