Qi Sizhe showed the imprint of the medicine bottle to Chen Chuchuan and said that he suspected that someone was developing drugs to make poison.Chen Chuchuan advised Qi Sizhe not to dwell on the past. Now that the result has been achieved, let it pass and don't keep it stuck in his heart.

Li Xiaoxi checked Zhai Xixi's chat software and restored a deleted QQ group chat record.The insurance company told Han Feng that Wang Chen had been suspended for investigation.Zhu Qingyue went to Zhu Xiaoshan and made it clear that Zhai Shanjun was not the murderer.Zhu Xiaoshan knew about that QQ group and said that it was full of people who had thoughts of committing suicide. He had also joined it before. Zhai Xixi was introduced to it because of his introduction. There was an elder sister Liu Qing who was a volunteer in the hospital who was responsible for educating them.Following this clue, Zhu Qingyue and Han Feng visited Liu Qing in the coffee shop and experienced the exchange meeting organized by Liu Qing. Shop assistant Xiao Lin was also in the group. She said that today was the last time she came here because she had found the light in despair.Han Feng found a picture album, which was full of photos of Mandala, and there were signatures underneath.

Su Huaining found out that Wang Chen had a customer a year ago, Song Qian, the daughter of Song Weimin, the owner of the restaurant where they often went to eat.Han Feng went to Song Weimin's hotel, which was closed. At the same time, Song Weimin drove Wang Chen to the lake in a taxi.

Early the next morning, a taxi was found sunk in the lake. After it was salvaged, Wang Chen was sitting in the driver's seat and Song Weimin was in the back seat.

Qi Sizhe performed an autopsy and found that Song Weimin had bruises on his neck, which were consistent with the safety belt. It was speculated that he had died before falling into the water. It was judged that he was strangled to death by Wang Chen with a safety belt. In this case, Song Weimin was probably strangled in the driver's seat and put in the back seat before the car sank into the lake.The owner of the car was a friend of Song Weimin and had an alibi at the time of the crime.Song Weimin had terminal kidney cancer, and Song Qian also died accidentally after falling from a building a year ago. The amount of the claim was also three million, and the person in charge was Wang Chen.

Han Feng found tire marks artificially covered up by the lake. He told Qi Sizhe that there was a third person at the scene and Wang Chen's death was not an accident.Qi Sizhe and Li Xiaoxi checked Wang Chen's phone records and found that a phone number called Wang Chen after Li Yiqi died. Wang Chen also called a phone number before his death. Now the two numbers match and have been canceled.

Wang Chen found a three million insurance policy in the box, and the policy holder was Xiao Lin.At night, Xiao Lin went up to the rooftop alone and looked at the lights opposite.After Qi Sizhe arrived, he followed Xiao Lin's gaze and saw lights flickering in the building opposite.Han Feng hugged Xiao Lin in time and saw that Xiao Lin was safe. Qi Sizhe went to the building opposite and saw someone.That person was quickly caught by Zhu Qingyue, it was Liu Qing.

Xiao Lin insisted that Liu Qing really cared about them and wanted to find a way out of despair for them.Liu Qing also told the police that Zhai Xixi and Xiao Lin paid because they loved their families and loved them enough to sacrifice themselves and use their own lives to relieve their family's pain, so she cooperated with Wang Chen.

The medicine bottle at Xiao Lin's house also had an imprint, just like the one at Li Shuting's house. Xiao Lin said that Wang Chen gave it to her, and that everyone in their group had such medicine, and she had taken it before jumping off the building.When Zhu Qingyue was visiting Xiaoshan in the hospital, he accidentally discovered the man who injected drugs and tattoos into Li Yiqi, so he quickly chased him out.