The daughter of the Northern District Police Department's commissioner visits Shrek to tell him something but is killed on the rooftop of the Southern District Police Department. The only witness, Shrek, is interrogated personally by the Northern District Police Department's commissioner. However, the questions asked during the interrogation arouse suspicion in Ying Xiong. Ying Xiong brings Shrek and Xi Ying to the rooftop of a high-rise building as the suspected shooting point. (Source: Viu)