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...