Laughing This recognition is a police undercover affairs because of a selection drug trafficking eucalyptus pieces Superintendent Pan SIR hunt . In fact , before Laughing join the police force , this is a gang member , has been to follow their boss a brother hard in the trail . A brother to take care of Laughing plus , Laughing , as a brother like pro- brother . A brother in order to protect their own sites and illegal business , actually requires Laughing recruitment- , so that he can grasp the police action . Laughing at the police academy outstanding , but unfortunately God get people , he did not have the chance to stay in the police force , because the anti-triad Superintendent Xian SIR Laughing the underworld smell attracted to actually assigned to do undercover officers . In this way , Laughing it became a "double undercover , and a brother also happy to Laughing was sent to the associations to deal with the gantry head . In this already complex situation , one thing Laughing situation more complex , he had fallen in love with the humpback 's sister Karen . Faced with the choice of the rule of law , gratitude , emotional , Laughing will be how to handle the problem? Whether to choose which side are a renegade , Laughing Finally, toward which side ?