Shinjuku incident's historical background?

Twenty years ago, Shanghainese and Fujian people took the lead in pouring into Tokyo, rewriting the history of the Chinese community in Tokyo. After 2000, a large number of China people from northeast China sought new residence in Tokyo. Today, it is estimated that there are more than 350,000 China people in Tokyo. Japanese media constantly hyped the news that "China people committed crimes in Japan", which aroused great concern. Dong Chengyi's filming of shinjuku incident also comes from real news reports. According to Dong Chengyi in an interview, "It was probably 1998, when I read a report in Asia Weekly. At that time, many foreigners came in from kabukicho, and there was a LAM Raymond Hall on the road next to kabukicho. Many gangs gathered and left, all of which were bosses and businessmen. There was a case in a restaurant opposite, and almost all of a person's head was cut off ... "Later, Dong Chengyi collected a lot of information about Japanese culture, gangs, immigrants and so on. The story that spanned many years was condensed in a few years, but it was preserved. It's still those very violent and bloody elements-at the end of last year, there was a post on a Hong Kong version of the forum, which talked about the feelings of watching shinjuku incident at the pilot meeting, and the participants' discussion on the film classification, emphasizing that some scenes were bloody, and Fang Ping, the producer of the film, also mentioned in an interview that if he wants to enter the mainland market, some bloody and violent scenes must be deleted, but these are important parts of the film, and deletion will have a great impact on the film's perception, so it is best to give up the mainland market.