Criminal profiler Fang Rijin (played by Carlos Chan) receives a strange call for help. The caller is from the future, predicting that many brutal murders are about to happen! Rijin, together with female detective Xing Kelan (played by Chen Xiaohua) and forensic assistant Zhuang Dingqin (played by Ruan Haozong), tries to stop the murders, but the murderer has already taken the initiative... Rijin finally knows the true identity of the caller, and learns that Kelan will be in danger, as well as her own final fate! However, Rijin loses contact with the future caller, and the killer is approaching them step by step! The clock of death begins to count down, and one difficult murder after another occurs. Rijin has to race against time to catch the killer as soon as possible and change the future...