Why are some old movies in Hong Kong always set in the mainland, telling the events of the 1960s and 1970s, making the plot completely different? Many of them were not available in the mainland at tha

Why are some old movies in Hong Kong always set in the mainland, telling the events of the 1960s and 1970s, making the plot completely different? Many of them were not available in the mainland at that time. Because even though Hong Kong was still under British control at that time, it was still China, so the mainland was always mentioned in movies, and Hong Kong was still a place that many people yearned for to live. In fact, many Hong Kong people are now in Guangdong, Shanghai, Zhejiang and other areas in the former mainland, but we have to admit that the mainland is indeed behind Hong Kong and has not accepted things as early as Hong Kong. Many people in Hong Kong are actually thinking about it. Just because they live in such an environment and get used to it, they are still very conservative. When they were young, they could see the culture of any country like this, let alone other places. The cultures of Taiwan Province Province and Hongkong seldom come into contact with us, let alone understand us. So they took your so-called four-portrait picture just because they didn't understand, didn't know and hesitated. At that time, China was still in the early stage of development, so they were sensitive and afraid of introducing foreign or Taiwan Province and Hongkong cultures into the mainland.