I saw a TV program covering this professions and had a couple of few young ladies who jumped into this profession, but that was pretty much it. They were desperately recruiting. Their earnings are pretty good, but still there are potential dangers.
My grand father escaped from Jeju when he was in early 20s. I wish he was still alive, so I could ask about the history. I have relatives, but always interesting to read these articles about people living in the area.