Liu Yun did not cooperate with the investigation, which surprised Qin Ming and Lin Tao. Qin Ming decided to start with the murder weapon to open a breakthrough in the case. Because Lin Tao usually likes to study fighting and cold weapons, he asked Lin Tao to help study this similar three-edged sword. Knife weapon. Lin Tao suddenly had an idea. He brought over the 3D printer at home. The two worked hard all night, and finally restored the model of the murder weapon. The effect was very ideal. Colleagues in the forensic team believe that this kind of murder weapon is relatively rare, which means that the unique shape and design will be relatively easy to find. Zhang Biao suggested to immediately report it to Team Li, and together with the on-site blood analysis, look for this kind of knife throughout the city.

Qin Ming and An Ran came to Team Li to report, and learned that she cooperated with the economic investigation department to investigate Yunxiangwei Store. Yunxiangwei Store ran into big trouble, and some victims showed signs of being defrauded at the door of Yunxiangwei Store. They also clashed with the police during the previous demonstration, demanding repayment of their hard-earned money. Lin Tao questioned the nonsense of these keyboard warriors. Huanhuan suddenly had an idea. Liu Yun was reluctant to speak, so he could use other means to get her to speak. When the truth came out, those keyboard warriors could shut up. Deputy Team Zhao It is believed that although Zhang Hua has a major suspicion, there are signs of theft at the scene, and the possibility of the victim of the Yunxiang WeChat Store is not ruled out. Lin Tao acted as a temporary captain. He asked Deputy Team Zhao to be responsible for pulling the net to arrest Zhang Hua. He and Huanhuan went to investigate the relationship between Liu Yun, Zhang Yaxin and Zhang Hua. As for the investigation of the murder weapon, Qin Ming and An Ran would do it.

Everyone carried out the investigation separately according to the plan. Lin Tao and Huanhuan visited Liu Yun's teacher. She was very impressed with Liu Yun and Zhang Yaxin. Liu Yun is the school flower, and attracts attention everywhere. Before Zhang Yaxin became "the stars know my heart", Liu Yun Yun is the only person in the class who helps her, and the two have a good relationship. Lin Tao and Huanhuan asked again who was closer to the two at that time. The teacher mentioned a girl named Yueyue, and they immediately found Yueyue and asked. In her mouth, Liu Yun became a snobby girl, and even The good thing about Zhang Yaxin in those days was just to use eyeballs. Zhang Yaxin became popular because the stars knew my heart, and Liu Yun became jealous. She used Huangfu Yajun to attack Zhang Yaxin. Not long after Zhang Yaxin committed suicide, she was sent out of the country by her parents. After returning to China, she only associates with people who have interests in her, and those former classmates and friends refuse to stay away.

Qin Ming and An Ran found the shop owner who sold Sanleng knives and learned that this kind of controlled knives needs to be reported to the Public Security Bureau, and some outdoor sports personnel will buy them as tools. Lin Tao and Huanhuan found Liu Yun and used Jiajia to open Liu Yun's mouth. She told the situation that night, saying that she was murdered by the murderer in another way. The murderer first pushed her into the bathtub and then put the hair dryer on. He went in, and after the power tripped, he stabbed himself with the knife again, and she woke up in a coma before calling the police. Qin Ming received feedback that the buyer of the three-edged knife was Chen Xiaodong instead of Zhang Hua, which meant that Zhang Hua could not use a knife to assassinate Liu Yun, so Liu Yun lied about this matter, which also Explain that she is hiding something.

An Ran and Qin Ming chatted about Zhang Hua on the way off work. An Ran thought it was very scary. The murderer was right next to them but they didn't find out. Qin Ming said that Zhang Hua's food was very delicious, but An Ran thought it was a mockery of her poor cooking. The two were laughing and fighting, and suddenly Qin Ming had the inspiration to solve the case. He boldly guessed that Zhang Hua might hide in the old chef Zhang. Qin Ming and An Ran carefully came to Old Chef Zhang, and they found Zhang Hua here. He was exhausted because of his serious injuries. Qin Ming asked him about the case. He hates all those who are related to his daughter's suicide. His survival is to seek justice for his daughter. At that time, Qin's mother was killed by Zhang Hua in order to protect Qin Mingcai. He wanted to let Qin's mother taste the pain of losing relatives. Fortunately, Yes, Zhang Hua fulfilled his promise to Qin's mother and did not kill Qin Ming.

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