i saw the timeline and the ming dynasty ruled taiwan in the 1600s.
Yes.
But before 1600's only the aborigines lived in Taiwan. Unfortunately, like many aboriginal tribes, they d not have a written law and they have no idea that land can be owned by individuals. When Europeans ruled Taiwan, they had only the aborigines to deal with. They were on the islands 8000 years before invaded by the chinese during the Ming Dynasty.
So best the Chinese return the islands back to the original people.
Do you know that until recently, the native people of taiwan were forced to use only mandarin names?