The first victim often played with women, so he was killed. In order to create the experience that his sister lied to him when he was a child, "My father cheated, my mother killed my father, and then committed suicide by jumping off a building, and my sister saved him", so he wrote a suicide note.
The second deceased was a prostitute, but she was not killed by Ling Jiahui, but by the third deceased (a loan shark man), and faked the second scene to confuse the police. This scene happened to be seen by Ling Jiahui, so he killed the usurer and cut off his genitals. Call yourself a hero on the video. Because this man likes to play with women, he cut off his genitals. Later, there was a story about recording a confession on a tape. Agent Ze Shao Chen wronged him. So he said that the hero had to face two bad guys again, and the result became four.
The fourth victim was a complete accident. Appeared after recalling the plot of childhood, which made many viewers think it was Ling Jiahui's sister. In fact, she is just a woman dealing drugs. When she called, she thought her brother was coming and tricked him into letting him go home. Ling Jiahui saw it, so she killed her with a pencil in her brother's hand, cut off her tongue and took her brother away. The recording also mentioned that all liars will die.
It was Ling Jiahui who hit Ze less with his car, which was consistent with what he said in the recording that he faced two fake policemen more often. But Chen Tan was sent by police officer Lu, afraid that he would find out the truth, because most of the dead were related to drugs, but police officer Lu thought that drugs had eaten black, afraid that he would find out that he was related to drugs.
Finally, Ze Shao was killed by Ling Jiahui, not Chen Tan. Chen Tan cried because Chen Tan lied to Ling Jiahui that he was his mother, which directly led to Ze Shao's murder. He is ashamed inside. As for who is the photo at the end of the film, I look forward to A+ detective.