A bizarre call for help, criminal profiler Fang Rijin (played by Chan Jiale) actually received a call from the future, and multiple shocking and brutal murders were about to happen!Ri Jin, together with the female police chief Xing Kelan (played by Chen Xiaohua) and his assistant Zhuang Dingqin (played by Ruan Haozhong) tried to prevent the murder, but the murderer seized the opportunity. Ri Jin met the most powerful opponent, a serial killer with extremely high intelligence!The call from the future was connected again, and Rijin finally discovered that the person calling him was actually Kelan from the future!In the future, Kelan is in crisis, and sadly tells the shocking truth that they will fall in love. Unfortunately, Ri Jin ends up losing his life at the hands of a serial killer!The call ended, and Kelan's future life and death were uncertain. Rijin had lost contact with the future, and the serial killer was approaching them step by step!The death clock keeps counting down, and one murder case after another that is difficult to solve continues to occur. Ri Jin must race against time to catch the serial killer as soon as possible and change the future. However, Ri Jin discovers that the real murderer has been around him all along...

Fang Yat Jin (played by Chan Jiale) discovered that his father Fang Yixin (played by Lu Zhenshun), a lawyer, was engaged in illegal activities. He gave up studying law in anger and left Hong Kong to study criminal psychology.At the same time, a reporter died accidentally. Policewoman Xing Kelan (played by Chen Xiaohua) learned that the accident involved wealthy businessman Fan Guohong, but was blocked by her boss from investigating, so she had to investigate secretly... Five years later, Ri Jin returned to Hong Kong to work as a university lecturer and was invitedAssisting the police in investigating the case, forensic assistant Zhuang Dingqin (Ruan Hao Zong)) found clues that allowed Ri Jin to profile the prisoner's habits... Ri Jin and Ding Qin found a body, and Kelan took it back to the police station for questioning, and finally found out the truth.Ri Jin received a request for help email from someone claiming to be Mary. Ri Jin contacted Mary but was surprised to see that Mary looked exactly the same as Kelan...

The call between Rijin and Mary was cut off instantly, and the email contained a photo attachment.Among them was a photo of a T letter written in blood. After searching, it was found that Ke Lan had lost his comrade five years ago while investigating Guo Hong.Ri Jin's friend Xie Difu informed that there seems to be a secret behind the forced reconstruction of Jing Yang Building related to the T word.Rijin was able to get on the phone with Mary again at the university, but when Kelan appeared, Mary disappeared.Rijin revealed clues about Jingyang Building to Keran, and Keran found out during the investigation!Ri-jin goes home and finds a certificate proving that Yi-shin is related to Guo-hong!Mary calls Ri Jin, and Ri Jin finally learns his true identity... On the other side, Kelan is being followed by a mysterious person!

Ke Lan found out that Yi Xin and Guo Hong were acquainted. When following Yi Xin, she met Ri Jin and managed to go to Fang's house to check.Ri Jin guessed Ke Lan's purpose, and when he was sending her away, he suddenly had a premonition that “ saw” that she would be in danger... Ri Jin's mother's account received a huge sum of money, and Ri Jin was convinced that it was from Yi Xin's criminal activities.Rijin wanted to find out what Kelan had found, but unexpectedly he and Dingqin were kidnapped!Rijin was rescued because of Dingqin, but Dingqin disappeared!Ri Jin angrily scolds Yi Xin, but Yi Xin is seriously injured in a car accident and is hospitalized, revealing his secret... Ri Jin returns to the mountain to find Ding Qin, but Yi Xin never wakes up.Ri Jin discovered that Ke Lan had spoken to Mary during his kidnapping...

Kelan found out the real cause of Yi Xin's car accident, and Ri Jin suspected that the incident was related to his kidnapping.Ruan Kang, a friend of Yi Xin who is a high-ranking official, visited the hospital and informed Ri Jin that Yi Xin had information about Guo Hong.At the same time, Mrs. Ruan asked Kelan for help, claiming to have evidence of Ruan Kang colluding with Guohong's officials and businessmen... Rijin found the note with the secret written in the letter, which was full of evidence of Guohong's crime. Just as he was about to hand it over to Kelan, Rijin suddenlyAfter answering Mary's video call, she saw Ri Jin in the future with her own eyes. The killer forced him into a white private car. There was a big explosion in the private car, and Ri Jin was buried in the sea of ​​​​fire on the spot!

Kelan privately informed the crime team to protect Mrs. Ruan. The incident alarmed her boss Jiao Zihong (played by Tan Kaiqi), and Kelan faced punishment.Mrs. Ruan concealed something, Ruan Kang finally escaped, and Guohong was still at large.Guohong's subordinate Ding Taichen was arrested for attacking Rijin, which became Guohong's only hope of proving his crime. However, Taichen pretended to be crazy in court and took all the charges.Rijin was unable to support the police because he was involved in the case, but he figured out a way to get Taichen to testify against Guohong, but he needed Keran's help... In another time and space, Mary was chased by Zihong and others, and Zihong pointed at Mary.Mary was accused of shooting and killing and became a wanted criminal, but refused to surrender and confronted Zihong...