Where did you grow up with such an accent?

Personal living environment has a great influence on accent. As you said, my parents immigrated to Hong Kong in the early days and gave birth in Hong Kong. Children in Hong Kong grew up with the novel Cantonese. If parents speak Shanghainese at home and children speak Shanghainese, then children may have a Shanghainese accent. If children can only speak Hong Kong dialect, but not Shanghai dialect, they generally have no Shanghai dialect accent.

As for looks and looks, they are inherited by parents, and they should look like their parents when they grow up. As both Shanghai and Hongkong are the main places where Han people in China live, the difference in appearance is not obvious. Because children live in Hong Kong and dress up in accordance with the trend in Hong Kong, it is difficult to tell where they are from. If African black children grow up in Hong Kong, they can speak fluent Hong Kong dialect, but their dark skin can tell at a glance that they are not from Hong Kong.

Shenzhen is an immigrant city. After the migrants settled in Shenzhen, many children born in Shenzhen can't speak their hometown dialect, only listen, and basically have no hometown accent. Judging from his appearance, I don't know where my hometown is.