In the play, Liu Qingyun and Nick Cheung are policemen, while Louis Koo is a gangster undercover policeman. From the beginning, Louis Koo slept in a simple single bed with only two black shelves and wooden cabinets. This background also plays a key role in the later scenes. Moreover, he is always worried about not sleeping well, and he is awakened as soon as he hears footsteps. After Nick Cheung bought the meal, Liu Qingyun read the newspaper at the gate of Louis Koo, and let Louis Koo sleep a little longer, then he protected him outside. Liu Qingyun closed the newspaper and walked into the room. Nick Cheung put the rice on the wooden cabinet, and Louis Koo stood up slowly. At this time, Liu Qingyun and Nick Cheung almost occupied the whole picture from left to right, while Louis Koo was between them. These photos are intended to highlight the situation in Louis Koo. Louis Koo sat up and took out five or six mobile phones, saying that each phone had a designated contact, one was a policeman and the other was a gangster. He put his head in his hands and didn't want to face the sun, which showed that he lived in the dark and he was afraid of dialing the wrong number. Please note that there are two meals on the table at this time, one is pork chops with tomato sauce for Louis Koo, and the other is fried noodles for Liu Qingyun. At the moment, there is a black shelf prop behind them, which is actually set by the director on purpose to show that Louis Koo and Liu Qingyun are linked. In all the shots, Nick Cheung is always on the sidelines, and Liu Qingyun pays special attention to Louis Koo. After chatting for a while, Louis Koo was hungry and wanted to eat. Nick Cheung worships Liu Qingyun, so he knows that he likes fried noodles, so he puts them in front of Liu Qingyun. But Louis Koo reached for fried noodles, Liu Qingyun gave it to him, and then went to eat pork chop rice. It is not difficult to see that in this short shot of less than 4 minutes, the relationship between Liu Qingyun and Louis Koo is a little better than that of Nick Cheung. All this made Liu Qingyun choose Louis Koo in the face of Nick Cheung and Louis Koo's life-and-death choice, and laid the groundwork for the reunion after many years.