Not sure how big the difference is, but she was forced by the Japanese to be a comfort woman, the Wikipedia talks about women during the US occupation, some who were perhaps more "freely" there. Although it does mention them being "owned" by the club/bar owners.
> In September 1945, United States Armed Forces, led by General John R. Hodge, occupied South Korea after Korea's liberation from Japan. This also included Imperial Japanese comfort stations.[39] These events continued the government-sanctioned prostitution that was established in Korea under Japan's rule.
Sounds like they just took over what the Japanese had put in place... which is interesting to me because a) I never had heard of it b) living in Japan, the comfort women is a recurring theme of tension with SK, but I've never heard about SK giving crap to the US about this.