According to Korean Yonhapnews, Korean women have increasingly been heading for Japanese market to work as "
Comfort woman".
The research said there are some 40,000 - 60,000 Koreans illegally living in Japan, in which
comfort woman will account for more than half or some
30,000 heads. In addition, some Young Korean men work in host club illegally as well. Working locations of Korean comfort women/men are spreading across Japan, not only Akasaka, Shinjuku and Ginza of Tokyo, but also Osaka and Kobe.... the report said.
한국여성들 `일본行 성매매' 극성 | 연합뉴스
Well... I personally welcome Korean woman, but being subject to valid work visa.