After He Rongyue checked out the car glass water, he guessed that the person cleaning the scene might have driven to the Whig Hotel, and Shen Yi took Ducheng's car glass water while he got off the car to buy things.

Du Qing invited Shen Yi to have dinner at home. At the dinner table, Shen Yi asked Du Cheng's abnormal state recently. Du Cheng only said that he was too tired. Shen Yi wanted to ask questions, but was interrupted by Du Qing. Shen Yi asked about Du Cheng’s watch, Du Cheng said that the watch was broken, Shen Yi said that he knew a watch repairer, Du Qing showed the watch that had been repaired to Shen Yi, and Shen Yi found that the scratch on the watch mirror was missing .

Lu Haizhou asked Li Han, Lao Yan and Jiang Feng about Du Cheng's character and characteristics, and when talking about the murder case due to human trafficking, Lu Haizhou pointed out that the murderer was always one step ahead of the police. Lu Haizhou visited Shen Yi's office and tried to understand Du Cheng from Shen Yi's mouth. Shen Yi suggested that Lu Haizhou communicate with Du Cheng directly. Lu Haizhou asked Shen Yi if he had any clues. Shen Yi recalled various events in Ducheng, but did not tell Lu Haizhou.

Du Cheng went to the seaside hut to investigate alone late at night, where M lived before his death. M's diary had been torn up, and Du Cheng had rubbed the imprint on the last page of the diary with a pencil. The document that M sent to Du Cheng that night was a photo, and told Du Cheng that the man in the photo was the murderer of Lei Yifei, and Du Cheng left the photo in the house before he left.

When Shen Yi checked M's relics, he found a lot of salt stains. He suspected that M had stayed at the seaside before his death. Shen Yi didn't want to disturb others and wanted to go to the beach to investigate alone. After Lu Haizhou learned about it, he wanted to investigate the city bureau's criminal police. Du Cheng decided to immediately send someone to act with Shen Yi. During the search, Shen Yi, who was in Du Cheng's group, secretly checked Du Cheng's driving record, but the driving record had already been deleted by Du Cheng.

Everyone found the seaside cottage based on the clues given by the grocery store, and the photos left by Du Cheng became the most important clue. After investigation, it was found that the man in the photo was named Zhou Jun, and Du Cheng decided to arrest Zhou Jun immediately. In private, Lu Haizhou bluntly said that Du Cheng's decision was too hasty. After all, Zhou Jun had alibi at the time of the incident, and Shen Yi did not agree with Lu Haizhou's idea.

Zhou Jun, who works in the library, was taken to the police station, but after more than ten hours of interrogation, Zhou Jun did not provide any valuable clues. Du Cheng personally went into battle and asked Zhou Jun whether he killed Lei Yifei, but Zhou Jun, who was in a trance, didn't answer. Seeing that the detention time was about to arrive, Du Cheng's mood collapsed, and Jiang Feng pulled Du Cheng out of the interrogation room. Lu Haizhou asked how Du Cheng knew that Zhou Jun was the murderer of Lei Yifei, and Du Cheng said that he was just cheating Zhou Jun. Du Cheng personally sent Zhou Jun back to the library, and Zhou Jun took him to the bathroom under surveillance.

Li Han found a vague figure in the surveillance of the Whig Hotel. Lu Haizhou wanted to ask the technical staff of Tongcheng Group to help restore the clarity of the image. Shen Yi proposed that he should draw a portrait of the figure. Shen Yi carefully observed the screenshots of the video and began to draw portraits, but only half of each portrait was drawn. Shen Yi looked at the portraits in a very unstable mood, and finally he drew a complete portrait, while the one in the portrait was very unstable. The person was actually Ducheng.

Jiang Feng asked Shen Yi for a portrait early in the morning, but Shen Yi was not in the office. Jiang Feng was very surprised when he saw Du Cheng's portrait on the drawing board, and at this time Du Cheng and Shen Yi were together. Shen Yi forced Du Cheng to ask, and Du Cheng started talking on the night of the incident.

On the night of the incident, M asked Ducheng to meet on the fifth floor of the Whig Hotel, but as soon as Ducheng got to the second floor, M fell from a height, and Ducheng saw the murderer. M had told Du Cheng that someone was chasing her, and the purpose of her cooperation with Du Cheng was to seek Du Cheng's protection. Du Cheng realized that there was a powerful man behind the whole thing, so he tried to use himself as a bait to attract the man behind the scene.

Du Cheng didn't want Shen Yi to be involved, because Shen Yi was his bottom line and the only chance to catch the real murderer.

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