In a residential area lined with modest housing complexes and old factories, there is said to be an underground brothel apartment that is not listed on the Internet. We infiltrated and filmed this hidden brothel that has been operating for over 30 years, catering to men who work in nearby factories! ! You might think that it's an underground brothel with only middle-aged women, but the customers are beautiful women in their 20s and 30s, and mostly Amateur! For some reason, there are a lot of hits, such as women who attend a women's university during the week and work on weekends and at night, and young wives who work only during the day. It operates without any advertising and only by word of mouth from the neighborhood, so it seems that beautiful women gather here because they can work part-time jobs in secret without anyone finding out.