Crime Mystery

A bloody serial murder shocked the city. The police were helpless and had no choice but to invite retired detective Lin Yu. During the investigation, Lin Yu discovered that he had a dual personality, one was righteous and wise, and the other was evil and crazy. He tried hard to control, but was secretly controlled by the second personality, forging clues and killing people. As the investigation deepened, the police began to suspect Lin Yu, but he was unaware of it and was still desperately looking for the "mysterious third person." In the end, will good defeat evil, or will darkness swallow him completely?