"Detective Kowloon (played by Zhang Jin) has a unique and ruthless way of investigating cases but has repeatedly achieved extraordinary achievements. He is an elite detective in the Hong Kong police. However, he is arbitrary and explosive in his work and is regarded as a "paranoid" by the police force. Kowloon was ordered to investigate a series of murders of a young policewoman. After exhausting all possible means, not only was there no clue, but the policewoman was unmarried..."