Where is Dimfragrance's "South Asia"?

It should be a general term, including the stories on TV in Malaysia, Singapore and other countries mainly happened in Jinchan Island. It is confirmed that the only one is in Jilin, China, so the place names on TV should all be fictitious. The TV said from the beginning that it was from Nanyang, but definitely not from China. But you will surely wonder why there are so many people from China, whose living habits are similar to those in China. In fact, it should be a place where Chinese people live in concentration. There is also an episode on TV about Penang, which is the second largest city in Malaysia, and most of them are Chinese. Television should be based on it.