Having a clear separation between black and white, placing heavy emphasis on discipline – both are the most important ‘boundaries’ for a cop. But if those boundaries are broken through and cops collaborate with crooks, the investigative process as well as the probability of cracking the case becomes limitlessly greater. A 12 year undercover agent living on the edge, a hot-tempered cop who once broke out of jail after he was framed for crime, a ‘King of Robbers’ who was once jailed for a crime he didn't commit and now specializes in robbing crooks, a ‘spinster’ female cop who had never fired a single shot in her life and relies on her wits as well as life experiences to ‘figure out’ criminals, a fugitive from the law who is obsessed with female cops but always puts righteousness ahead of all else, and finally a high-ranking female officer who is also a military weapons expert – together, they will match wits as well as match strength. Out of this will come not only love, hate, and sparks, it will also break all boundaries – joining forces to crack cold cases and locate criminals, it creates an entirely different battlefield. Through blood, tears, life, and death, these most ‘hot-blooded’ of cops and criminals manifest the brilliance of human nature, leaving behind one touching, heart-stopping story after another.