When the Japanese invaded China, did they leave many descendants in China who invaded China?

After the establishment of diplomatic relations in the 1980 s, most of the people who used to be in the mainland returned to Japan, and now there is basically no mainland. In Taiwan Province Province, it is said that more than 200,000 Japanese have destroyed their household registration and concealed their identities, thus becoming China people. Now, with the descendants of Japanese traitors and those years, it is estimated that there are more than 2 million Japanese. These people are the main force of stubborn Taiwan independence.