Answer:
During the occupation, Japan took over Korea’s labor and land. Nearly 100,000 Japanese families settled in Korea with land they had been given; they chopped down trees by the millions and planted non-native species, transforming a familiar landscape into something many Koreans didn’t recognize.
Nearly 725,000 Korean workers were made to work in Japan and its other colonies.
I don't know if this will help you, but it might!