During the meeting, Guan Hongyu raised two doubts. First, the material of the telescope in Dong Qian's car is very easy to stick to fingerprints, but this telescope is very clean; second, the 1961 red wine in Dong Qian's home has not been found yet.Jiangzhou police sought his guidance and investigation direction, but Guan Hongyu got stuck.Gao Yanan reminded that the circulation range of such expensive red wine should be very small. Guan Hongyu understood what she meant and suggested that the police check if anyone had recently sold a bottle of 61-year-old Lafite.When the police heard what he said, they couldn't help but think that in addition to Dong Qian, there might be other accomplices in this case.Guan Hongyu later added that Dong Qian’s case was probably committed by a victim who was injured by Dong Qian but was still alive.

Guan Hongyu always suspected that Dong Qian did not hang himself to death, but the evidence found by the forensic doctor and the technical team confirmed this.He went to the scene of Dong Qian's death and tied a knot in a tree with a towing rope. Then he stepped on rocks and simulated the scene of hanging while Zhou Shutong watched to prevent him from getting into trouble.After he was done, he found that the marks on the tree where the rope was hung were very messy, while the marks on the branches at Dong Gan's site were very neat.Guan Hongyu concluded that Dong Qian was not a suicide, but a homicide.The two went to the parking lot again. Dong Qian's car had no electricity at all, so Zhou Shutong bought a battery to generate electricity for the car.The two rested for a long time with the CD playing in the car. Suddenly, the CD was turned off and the power in the car was cut off.Guan Hongyu used the key to start the car again, and there was electricity in the car again.Guan Hongyu explained that this is the car's power-off protection. Generally, when the battery is below a certain percentage, the car will automatically activate the power-off protection to prevent the car owner from being unable to start the car due to lack of power.But Dong Qian's car had no electricity at all when it was found, which meant that someone had tampered with the car's battery.

Liu Yin and Guan Hongfeng have arrived in Jiangzhou, and the two brothers successfully handed over under the cover of Gao Yanan.During this period, Zhou Xun asked Zhou Shutong about his recent monitoring of Guan Hongfeng. Zhou Shutong praised Guan Hongfeng's conscientiousness and advised Zhou Xun to be less suspicious and suspicious of Guan Hongfeng.Finally, she firmly told Zhou Xun that she no longer wanted to be used as a spy to monitor Guan Hongfeng and a tool to contain Liu Changyong.At this time, Guan Hongfeng came over after the handover. Zhou Xun called him and asked him and Zhou Shutong to leave their fingerprints for the Jiangzhou technical team to investigate the scene.Fortunately, the handover has been completed, and Guan Hongfeng and Guan Hongyu escaped. Guan Hongfeng couldn't help but feel happy when he pressed his fingerprints.

When the meeting was held again, the general direction of solving the case was basically determined: Dong Qian had violated the five victims who were found, but behind him, there was a co-murderer, and the murderer of Dong Qian must be this person.Guan Hongfeng conducted on-site reconstruction speculation: that night, the murderer called Dong Qian to the crime scene on the grounds that his car's battery was out of power and he needed Dong Qian's help to tow it. Then, he strangled him to death with a towing rope while Dong Qian was helping.He also used a fixed pulley to hang the body on a tree, and faked the scene of Dong Qian's suicide.Finally, he set the focus of the monocular to the location where Dong Qian dumped his body, then replaced the battery of Dong Qian's car in his own car and drove away.Everyone present marveled at Guan Hongfeng's clear and logical combing. Guan Hongfeng added that Victim No. 4 was strangled from behind, but based on the direction of his spinal dislocation from left to right, it can be concluded that the murderer was left-handed, and Dong Qian was not left-handed., therefore, victim No. 4 was Dong Qian’s co-defendant.

Liu Changyong sent someone to follow Ye Fangzhou to the Jingang Hotel and then called the plainclothes back to the police station. He kept waiting at the door of the hotel.Who would have thought that Ye Fangzhou had already discovered Liu Changyong's tracking. He called his accomplice and asked him to help him solve Liu Changyong's tracking.On the other hand, Zhou Xun went to the military region to check Anting's files and learned that Anting was fired because of the leakage of scrapped guns.

Liu Changyong checked Ye Fangzhou's call records but found nothing. Zhou Xun asked him to strictly control the confidentiality scope of Ye Fangzhou's situation, and the scope was set between the two of him and Guan Hongfeng.Zhou Xun did this to test Guan Hongfeng. He wanted to know if Guan Hongfeng knew about Ye Fangzhou's situation, would he take any action to reveal the evidence that he, Guan Hongyu and Ye Fangzhou were in a group? And even if it could not prove that the three of themIf there is a relationship between them, Guan Hongfeng can also help solve the case, killing two birds with one stone.

When Zhou Shutong investigated the properties of Dong Qian's community, he discovered that Feng Kun, a pipe repair worker, also worked at Youwang Chemical Factory six years ago. He was the victim of Dong Qian's biggest assault on male employees that year.When the police investigated Feng Kun's Volkswagen car, they found an Audi brand battery that did not match it. Guan Hongyu concluded that Dong Qian was killed by Feng Kun.He felt that Feng Kun must have been caught by Dong Qian, so he became Dong Qian's accomplice and killed and dumped his body. He even used his own income to pay for Dong Qian's mortgage, car loan and the cost of collecting red wine.As for the cause of the case, it was probably because Feng Kun could no longer endure Dong Qian's coercion, and his visit with Zhou Shutong made him more determined.

Guan Hongfeng felt that this case could make such great progress thanks to Guan Hongyu's persistence and efforts, so he praised Guan Hongyu and asked for an early handover. He wanted Guan Hongyu to personally capture the murderer he caught.

Soon, Guan Hongyu and Zhou Shutong found Feng Kun hiding in the hotel, and also discovered the 1961 red wine in the room.It turned out that Feng Kun was on duty when the factory leak occurred six years ago. He locked the door of the raw material factory that day, and Dong Qian happened to see it.The accident killed two workers. Dong Qian had been threatening Feng Kun to support him and kill and dump their bodies for him because Feng Kun killed them.Guan Hongyu told Feng Kun that if he hadn't closed the door back then, more people would have died.Hearing these words, Feng Kun's regret and helplessness were intertwined. Guan Hongyu opened the red wine and poured a glass for Feng Kun. The two had a drink before Feng Kun was arrested.