Episode 1

As a criminal police officer, Xu Jingzhi (played by Duan Yihong) was entangled in the doubts in the case of an old friend. He had inner demons and asked to leave the team for further studies and became a criminal psychology professor at Wuyang Police Academy.On this day, Xu Jingzhi came to school as usual. He didn't notice anyone secretly filming him on the road. In class, Xu Jingzhi taught everyone about criminal psychology, but when students asked him why he left the criminal police team to become a university professor, he chose to remain silent.

Zhuang Mingcheng (played by Dou Xiao) also came to attend Xu Jingzhi's class. After class, he saw an old man looking for Xu Jingzhi. Zhuang Mingcheng said that Teacher Xu no longer teaches here, and if he wanted to contact Teacher Xu, he could help.Lu Youliang had no doubt that he gave Xu Jingzhi's phone number to Zhuang Mingcheng.

Zhuang Mingcheng stuffed the note under Xu Jingzhi's door and pretended to ask Lu Youliang to meet Xu Jingzhi at the beach at night. Lu Youliang believed it and walked into the boat alone. When he found that no one was on the phone, Zhuang Mingcheng quietly took it from the back.A dagger came over. Lu Youliang didn't understand why this man wanted to kill him. When he heard Zhuang Mingcheng said that he was avenging Xu Jingzhi, he thought that Xu Jingzhi was looking for someone to settle accounts with him. He hurriedly confessed Jiang Yongquan, saying that he had raised Xu Jingzhi after all.Zhuang Mingcheng didn't listen to the man in front of him. He cut his body open and let the blood flow out.

Xu Jingzhi called Lu Youliang. Lu Youliang was already on the verge of death after being slashed with a knife by Zhuang Mingcheng. Zhuang Mingcheng deliberately brought the phone to Lu Youliang who was lying on the ground. The moment Lu Youliang received the call, Zhuang Mingcheng grabbed the phone and listened to Xu Jingzhi's voice with great enjoyment until Lu Youliang died, as if he was back in his childhood.Xu Jingzhi was trafficked for a period of time and was named Lu Yuan by a scammer. There he also befriended a younger brother, Lu Ran, who had a mentally disturbed mother.Lu Yuan wanted to escape every day, and finally escaped one day.

The fisherman found a body while fishing the next day.He Ya and Liu Ming arrived at the crime scene and inspected the body. They found that there were traces of dragging at the scene and that the body was sealed with beeswax. It needed to be taken to the laboratory for testing as soon as possible. Moreover, the cuts on this man's body were very unique.Xu Jingzhi received instructions from his superiors to return to the bureau to investigate the case.Xu Jingzhi browsed a large number of books in the library and looked up the origin of the clothes worn by the deceased.

Zhuang Mingcheng came to his secret basement and looked through the photos he had compiled before. The black room was filled with photos.Xu Jingzhi looked at the scratches on the corpse and tried to use psychology to infer the psychological purpose of the murderer.After finally getting some inspiration, Zhuang Mingcheng came and said that he liked Xu Jingzhi's works very much. Xu Jingzhi acted very coldly, so Zhuang Mingcheng put down the book in his hand and left.After Xu Jingzhi returned home, he searched many times and found that the pattern on the deceased was actually related to the book Zhuang Mingcheng had taken before, and there were some inexplicable similarities between them.

When Xu Jingzhi returned home, he picked up his award and recalled what his superiors had told him. The criminal gang that had trafficked him before had now shown signs of activity and was deeply rooted. It had been lurking in the dark for many years.Xu Jingzhi then remembered that he had recognized his younger brother Lu Ran before. They were discovered when the two of them were escaping. In desperation, he had no choice but to leave his brother behind and run away alone. In the end, he indirectly killed the murderer he was chasing through a car accident.When Xu Jingzhi was rescued, he only told the police where he had left his brother.Zhuang Mingcheng looked at Xu Jingzhi's photo and smiled happily, silently saying in his heart that he was finally back.