Cheng Bing learned from Zhang Shuqiao's brother that when Gu Erqiang robbed the rough stone and killed someone, he could not be sure whether the person killed was Wang Dayong.

Due to an accident at home, Lao Liao decided to go home, and Cheng Bing also persuaded him to go back and take care of his injured wife.

According to the test, the deceased in the car was not Wang Dayong. Cheng Bing did not want to injure his teammates anymore, so he lied that the deceased was Wang Dayong, bought tickets for everyone to leave, and then left alone.

Everyone gathered at the barbecue restaurant and learned that Shitou decided to stay in Jiecheng for the sake of intermediary girl.

There was a shooting case in Xi'an. Pan Dahai discussed the case with the police and later learned about the pistol from the man.

When several people were eating together, Lin Ying heard someone claiming that the soldiers had killed Wang Eryong. When she was confronting them, she learned that the murderer had been caught.

After everyone rushed to the scene, they discovered that the person they arrested was not Wang Dayong. After interrogation, they learned that this person's gun was stolen in 2008.Seeing that the man was unwilling to cooperate with the interrogation, Pan Dahai directly stated his purpose of coming, and then used the photo to pry open the man's mouth and learned about the circumstances of the man's murder of the people in the car. Afterwards, he decided to go to Northeast China to investigate.

Cheng Bing found no clues about the original stone in Jiecheng and decided to head to the northeast.

Cheng Bing was transferred to the Northeast to look for Liu Danan, the owner of the bathhouse who lost the bathhouse due to gambling. Later, he met Pan Dahai, who also came to the Northeast to investigate. They had dinner with Pan Dahai and talked about the past.At the dinner table, Pan Dahai threatened Cheng Bing not to investigate anymore because he suspected that Cheng Bing had concealed Wang Dayong's intention to bring him back to cooperate with the investigation. However, Cheng Bing insisted on finding his lost self through this case.