Qin Ming was dismissed from suspicion because he had proof that he was not at the scene of Guan Lu's murder. At the case analysis meeting, An Ran introduced Guan Lu's autopsy. Qin Ming proposed two tools for committing crimes, a hammer and a bamboo stick, while Zhang Biao judged the school personnel. The possibility of committing a crime is high. Everyone began to discuss the details of the murderer's crime, guessing that the murderer was likely to pick the lock first and then enter the house, and then wait for Guan Lu to return before committing the crime. The teacher who reported the crime found that Guan Lu's house was not turned on at the time. If the light was turned off after the crime, It is possible to leave a blood mark on the switch, in fact, only Guan Lu's fingerprint is at the switch.

After the meeting, Lin Tao and An Ran both apologized to Qin Ming. In fact, Qin Ming was not angry. After all, they were also exercising their police duties. Lin Tao sent Qin Ming and An Ran home, and left in a hurry. An Ran made fun of him for running away. Going to find the ring. Qin Ming felt that the atmosphere in the house was not right. The table was full of vegetables but no one was there. The chairs were crooked, as if someone had come. The third brother was injured. She wanted to go forward to check, but Qin Ming pulled her back, because the perpetrator might still be at the scene. Before he could finish speaking, Qin Ming was knocked down. An Ran fought hard until the perpetrator shouted to stop and revealed his true face. It turned out to be Lin Tao. At this time, everyone appeared and sang a birthday song to celebrate An Ran's birthday. An Ran was both surprised and delighted. She said that she did not know when her birthday was. Lin Tao told her that Qin Ming helped her find out the birthday. Even today, An Ran said that she was very satisfied with her adoptive parents, and she also thanked Qin Ming. pay.

There was a sudden power outage in the house. Some people said that it might have tripped. This reminded Qin Ming of the murder of Guan Lu. The perpetrator may have closed the switch at the end. Sure enough, during the next day's survey, they were on the switch box. Fresh fingerprints were collected. Everyone analyzed that the possibility of acquaintances committing crimes is very high. Li Team and others found through interviews that two years ago, it was rumored that Lin was haunted.

Team Zhao took people to the security office to understand the situation. They learned that on the night of Guan Lu’s incident, a security guard named Han Dong was not in the dormitory. He still had the skills to unlock the lock. The scout found a lot of pornographic videos on his computer. Dong's suspicion of committing the crime is getting bigger and bigger. Qin Ming analyzed that Han Dong could not be satisfied for a long time because of sexual repression, so he used more extreme methods to obtain satisfaction, and abnormal sexual assault became an important way for him to be satisfied. More and more evidence points to Han Dong. He was imprisoned for abusing his ex-wife Hu Ling. The scouts visited Han Dong's brother. He told Han Dong's unbearable experience. Back then, Han's mother He was seriously ill and wanted to hug his grandson as soon as possible, so Han Dong’s brother asked someone to introduce him to his younger brother, but he was cheated on marriage. Han Dong was not willing to be deceived and wanted to have a relationship with Hu Ling. Dong's yin caused him to be sterile for life. Han Dong's temperament changed greatly. He not only imprisoned Hu Ling, but also violently resisted the police and stabbed his brother in the eye.

Han Dong is the murderer, but he does not know where to go. Lin Tao thinks that he may have absconded in fear of crime, but Qin Ming is worried that Han Dong has already aimed at the next victim. At this time, Huanhuan called and said An Ran disappeared. It turned out that Han Dong's next crime victim turned out to be An Ran. Team Li brought people to the scene and locked the suspect's vehicle through surveillance, but the vehicle disappeared at the fork in the city. Han Dong may choose to commit the murder from a dark angle. According to this speculation, the two found the suspect vehicle and arrived at the scene in time when Han Dong was about to commit the murder. Finally, Han Dong was arrested and brought to justice, but An Ran was stabbed by a bamboo stick.

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