Who is the murderer against black passers-by?

The killer of black passers-by is Gu Zhangrong, the father of policeman Gu Xinyi. At the beginning, Gu Xinyi trusted her father very much, and even told his father many things at the police station as jokes. However, I didn't expect her father to listen to everything, but he was quietly planning something in private. Until later, Gu Xinyi discovered that his father Gu Zhangrong was probably related to a series of cases he began to investigate.

Gu Xinyi got a lot of evidence in her hand, which proved that her father was probably the culprit of all cases, but she didn't want to believe that her seemingly kind father was such a person. To this end, she and her colleague Zhang Xilun designed it together, trying to lure her father into the game to see if the murderer was him.

They got a lot of clues through the actress Zhuang, but Gu saw the flaw at a glance. Not only did he not take the bait, but he also tried to sound out his daughter to see who came up with the plan. Fortunately, Gu Xinyi had been prepared for Gu, so she was fooled in a few words. However, Gu insisted on monitoring and saw that the female star was instructed to do so by her daughter.

In fact, the practice of this bureau is indeed full of loopholes. Gu is a cautious person. The female star touched Gu's mobile phone when she left, and Gu could understand it with only a few eyes. Therefore, if Gu Xinyi wants to expose Gu Zhangrong, it needs to be honed slowly. After all, Gu has worked in this line for many years.