One day in 1997, near midnight, a group of young people were having fun and sweating in a crowded dance hall.The music in the dance hall suddenly stopped. Zheng Bei led the criminal police to search and blend in. They were recognized and started fighting with one enemy. In the end, all the people involved were subdued. After a brief questioning, they were escorted to justice.

On the other side, in the northeastern city of Harlan, Harlan Railway Station was forty minutes before midnight. Two bald men were sitting in a car, and a young man soon arrived.Forty-seven minutes passed in the blink of an eye. A bald man was clinging to the window edge and was about to fall from the building. Another bald man fought fiercely with the man in the room. He was covered in injuries and was eventually stabbed to death by the man multiple times.

By the time Zheng Bei brought someone to justice, it was already late at night when the bureau suddenly received a murder case and immediately drove to the Harlan Northeast Iron Glass Factory.The dormitory building was in chaos, with blood all over the floor, and the air was filled with a strong smell of blood. Zheng Bei checked the scene and confirmed that it was a vicious murder. The murderer escaped and it was by no means a small case.

At this time, in Huazhou City, eastern Guangdong Province, police academy student Gu Yiran was persuaded by Teacher Chen to stay in school like his father after graduation.Before Gu Yiran could think about it, he unexpectedly discovered that his sister Xiaoxiao had died tragically at home. She was covered in scars and her eyes were open. It was obvious that she had died of drug overdose.Gu Yiran learned through his father that Sister Xiao was dating Huang Jiahui, a man who was idle in society, so he called the police to arrest him.

The major case team visited multiple parties to investigate and sorted out the case information overnight. The two deceased were glass factory security guards. The man who was stabbed was named Song Wu, and the man who fell from the building was named Song Wen. They were both brothers.The reporter, Jiang Xiaohai, was in the team answering Zheng Bei's questions. He was frightened the whole time. He was obviously frightened by what happened that night, but no one noticed. When he left the police station, he had a complicated expression. A picture flashed through his mind, that is, he watched with his own eyes.Song Wen was thrown to death.

Although it was obvious that Huang Jiahui had taken drugs, it was still not detected, so the police suspected that he had taken methamphetamine, a new synthetic drug, which is much more harmful than the drugs he is exposed to daily.In order to continue to investigate Huang Jiahui, Gu Yiran deliberately provoked him to beat the police, and then detained him for a few more days for picking quarrels and provoking trouble, taking this opportunity to find out the situation as soon as possible.

However, Gu Yiran's father said that the current equipment technology is limited and it is difficult to detect it in a short time, but he believes that his son can find clues.Sure enough, Gu Yiran lived up to his expectations and made a new breakthrough.On the other hand, the forensic doctor found that there was suspected methamphetamine in the clothes of the deceased Song Wen. Zheng Bei analyzed that the motive for the murder in this case was probably drug addiction or a vicious conflict caused by uneven distribution of the spoils.

Not long after, the police found a large amount of methamphetamine at Huang Jiahui's residence and captured the den in one fell swoop.Gu Yiran regretted not protecting his mother well when he was a child, and now he didn't protect his sister well.Zheng Bei reported the case to Director Gao Linsheng as soon as possible. After intensive discussions with superior leaders, they believed that the nature of the case was serious and decided to set up a task force and appointed Zheng Bei, who was experienced in criminal investigation, as the team leader.

But Zheng Bei believes that if he wants to set up a task force, it is not enough to have Zhao Xiaoguang. He needs to introduce more technical experts and boxing masters.Then the task force ushered in the first person. Looking at the tall man, he thought he was a master of boxing and kicking, but he didn't know he was actually Ding Guozhu, a trace inspection expert from the Criminal Technology Section.In addition, Zheng Bei found his junior sister Zhang Xueyao, who is a national Sanda champion and has great skills. Gao Linsheng wanted to invite Professor Gu from Huazhou Police School to join the task force, but Professor Gu had something to do and couldn't come over. Zheng BeiDidn't feel the need to involve the chemistry teacher.

But at Gao Linsheng's insistence, Zheng Bei had to go to Huazhou in person to ask for Professor Gu, but he never thought that Professor Gu was actually the young Gu Yiran.It turns out that Gu Yiran was affected by the Xiaoxiao incident and decided to stay in school to become a chemistry expert, and applied to the school to establish a laboratory to specialize in the study of new drugs.