Why did Chongqing Forest in Wong Kar-wai get such a name when it was filmed in Hongkong?

There is a building in Tsim Sha Tsui called chungking mansions. The film was shot there. Because there are all kinds of people living in that building, it is very complicated. So when director Wong Kar-wai passed by when he was a child, his mother would tell him not to look and not to go in. Later, when he grew up, director Wong Kar-wai decided to make a film there. Show those people's lives. The forest is the reinforced concrete forest of the city, which shows the isolated and alienated living conditions of urbanites and also shows the theme of the film Chongqing Forest. In this way, the film is called .