Under the neon-soaked city, Organization Criminal investigation captain Gu Nan was so busy trying to crack the case, but he didn't realize that the most inconspicuous police officer around him, Mo Chi, a young man who appeared to be weak and docile, was actually the swordsman walking in the darkness. When the mask peels off, Mo Chi declares with crazy obsession that "the darkness needs to be broken", while Gu Nanji insists that "the law cannot give in to the law." A brutal showdown about the definition of justice unfolded on the edge of law and lynching.
