Why do Singaporeans shoot some historical TV dramas in China?

First of all, you should know that many people in Singapore are Chinese, about 2.72 million, accounting for 74.7%; Most of them also use Chinese as their main language. Many of their ancestors were asylum seekers from the southeast coast of China, and many historical and cultural backgrounds were the same. So they will shoot many historical TV series in China. Because their ancestors used to be the creators of these histories.