Downstream? Countercurrent? The reason Tsui Hark wants to explain is very simple, that is, the meaning of survival, and his personal understanding has been bluntly said by the characters in the film. "What is the world? It turns around, but it turns itself around. " You can imagine Xu Dao's confusion and frustration when he came back from America. ? In the film, A Zheng Shen Jing is a South American mercenary. After the baptism of bullets, he longed for a quiet life and fled from the unbearable past. Azhuo came to have an affair, but he was tired of ordinary life and longed to fly to South America. Upstream and downstream, both of them are so turbulent. When they meet, they are bound to stir up a thousand waves. ? Of course, the helpless life failed their ideals. Ajie had to stay in Hongkong because of love, and A Zheng's escape was not so smooth. He had to avoid being chased by his former comrades. Fortunately, they are still optimistic and positive in the face of difficulties and full of confidence in life. The meaning of existence, like a matter of life and death, has attracted countless philosophers to bend over. We Xu Dao naturally have no way to make it clear. However, with the development of the story, we can understand that there are no people who are always optimistic and there are no people who are always pessimistic. To survive is to make great achievements in contradictions, forget the concepts of time and pain in constant self-adjustment, and spend it day after day.