What does the movie Suzhou Creek mean?

The film tells the story of an ordinary cameraman in Shanghai who shoots others for a living. The Suzhou River in his eyes is a dirty river running through Shanghai, and the different lives of ordinary people are being staged on both sides of the river. One day, the owner of a bar found him and asked him to shoot something special. The boss pointed around, and he realized that it was to drum up business and let him take a picture of a mermaid swimming in the store. The photographer gradually got to know Meimei, the girl who plays the mermaid, and learned the story of Motor and Peony from her mouth. Moto is a gangster postman who delivers goods from one end of the city to the other on a motorcycle bought from a thief. Once, someone asked him to give a little girl a peony. After several times, Motor became familiar with Peony and fell in love with her. But soon Mada was involved in a kidnapping plot, and the kidnappers tried to blackmail Peony's father into kidnapping Peony in exchange for money. The kidnapper is a friend of the motorcycle gang. They asked Mada to kidnap the peony on the way to deliver it. Motor didn't want to do this, so he was forced to agree by his friend. After getting the money, Peony knew that she had been cheated and jumped into Suzhou River in despair. The last sentence is that she will become a mermaid and never appear again. In order to monopolize the money, the male kidnapper killed the female kidnapper and fled with huge sums of money, but he was rounded up by the police and finally jumped to his death. Mada was also jailed for his involvement in kidnapping. Many years passed before he came out. But he still missed the peony, and he inquired about the peony everywhere through the delivery time. When I was drinking in a bar, I found that the girl who played the mermaid looked like a peony, so I tried to get close to her. The photographer knew this and thought that the motor was robbing his girlfriend, so he found a thug and beat the motor up. Motor gradually realized that Meimei was not the peony he was looking for. Asked the photographer to use his relationship with the police to help him find the peony, and the photographer promised him. Soon, the photographer received a bottle of vodka with weeds and learned from the letter that the motor finally found peony in a convenience store with his help. The photographer thought this was the end of the matter, but he was summoned by the Public Security Bureau to identify the people who died in the car accident. The photographer came to the scene of the accident. It turns out that Mada and Peony drank too much vodka. When they crossed the bridge of Suzhou River with Peony, their motorcycle fell into the river and they drowned. Meimei also came to the scene and finally believed that what Mada said about Peony was true. Finally Meimei left the photographer to see if the photographer would look for her like a motor. As a result, the photographer didn't go to Meimei again. They have nothing to do with each other, but they look alike. The love that happened by the Suzhou River may be his main line. You can watch it on the 526 movie network.