Ducheng took Shen Yi home for dinner, and got off to the supermarket to buy soy sauce. Thinking of He's inspection, there was a layer of water wax on the dial glass, which was used to clean the car, so I took this opportunity to get off and go to the trunk of Chadu City. Shen Yi found the cleaning liquid in the trunk, poured some specially, and prepared to take it back for any test. When having a meal, Shen Yi was interested in talking about Du Cheng's watch. Du Qing immediately helped Du Cheng answer, saying that Du Cheng's watch had been repaired. When Du Qing finished, he took out his repaired watch. Shen Yi picked up his watch and looked at it. It turns out that the scratch is still there, and Du Cheng's watch is fine. Lu Haizhou took advantage of the investigation to talk to everyone in the bureau about Du Cheng and secretly investigate Du Cheng. After talking with everyone, Lv Haizhou also talked to Shen Yi to sound out Shen Yi's tone and see if Shen Yi had made any new discoveries. Shen Yi had a clue, but he didn't say anything except that he hadn't found anything yet. In the evening, Du Cheng hid in the room where He Hong lived, looking for clues left by He Hong. Du Cheng found that one page of the notebook was torn off at the scene, so he had to check the contents of the notes by scratching. Du Cheng after reading the notes, give him the photos of the murderer of Eric's mining team and put them in that room. The next day, where to ask about the test results, and take away Eric's relics for investigation. Therefore, judging from the traces on Eric's shoes, Eric lived by the sea before.

After Shen Yi made a new discovery, Ducheng took people to the seaside to investigate, hoping to let people know what was in that room as soon as possible. Shen Yi thought Du Cheng's behavior was suspicious. On the way to the seaside of the capital, when he got off the bus and asked for clues, he quietly checked the driving recorder of the capital, only to find that the record was emptied. Du Cheng got on the bus and found that the position of the driving recorder had changed, so he understood that Shen Yi had moved, but he kept on walking without saying anything. Du Cheng used a driver's confession to take everyone to the house in a small fishing village and let everyone find the photos of Zhou Jun left by Eric. After Zhou Jun's photo was discovered, Jiang Feng analyzed Zhou Jun's clues and told everyone, and Du Cheng immediately ordered Zhou Jun to be summoned after Jiang Feng finished speaking. Lu Haizhou thought Du Cheng's decision was too hasty, but Du Cheng resolutely did so, and Shen Yi didn't say much. He can only look at the situation first. Du Cheng and Jiang Feng went to the library to monitor Zhou Jun and tried to arrest him, but Li Yuhan found something suspicious in the surveillance video. He was taken back to the station for several hours without saying a word. Everyone thought he might have arrested the wrong person, but Du Cheng didn't give up and interrogated Zhou Jun himself. When Du Cheng interrogated Zhou Jun, he quietly put He Hong's button that didn't belong to him at hand to show him, trying to force him to tell the truth, but he still didn't say anything. Du Cheng thinks that Zhou Jun must have contact with He Hong, who may have been killed by Zhou Jun, but Zhou Jun denies anything, so he was so angry that Du Chenggang and Zhou Jun started work, Jiang Feng and others stopped Du Cheng in time, while Lu Haizhou was stopped in Du Cheng, asking Du what made him so sure that Zhou Jun had something to do with He Hong's death. Du Cheng claimed that what he said was made up by himself to deceive Zhou Jun, and there was no way for him to make way for Haizhou. Li Yuhan reported the person photographed by the surveillance, but could not restore the face of the person. Therefore, Shen Yi suggested that he should try to restore the characters' faces.

When Shen Yi looked at the monitor and tried to recover, he found himself drawing a pair of eyes in the capital, which made him feel scared. When Shen Yi found out that he had painted the capital, the more he painted, the more afraid he became. He threw away the painting angrily, but finally picked it up and continued painting, completing the restoration of Du Cheng's face. When Jiang Feng went to Shen Yi to get paintings, he saw the Capital Map painted by Shen Yi, so he called the capital to explain the situation. After Shen Yi finished painting, he went to Ducheng to ask for the result. Jiang Feng also called Du Cheng at this time to tell Shen Yi about his paintings. Shen Yi asked Ducheng for the truth, while Lu Haizhou went to Chen Zhou with the monitoring, and relied on their company's system to restore the monitoring content. Du Chengfang that night, he got a call from Eric. He was framed and killed Eric, indicating that he deliberately erased the traces of the scene, deliberately left a flaw, and turned the police's attention to Zhou Jun, just to force the people behind Eric to make moves again, so that he could find them all. Du Cheng told Shen Yi everything, indicating that he planned all this, and Shen Yi was his last card. He hopes that Shen Yi can help him find the people behind the scenes. Lu Haizhou got the restored surveillance video, which proves that the person in the video is Du Cheng.