In more straightforward language: these are slaves.
[late edit]: Here's more about how these slave women are treated:
- "In contrast, he said the high achievers are rewarded with a trip to a North Korean restaurant, where they can pick one of the waitresses to spend the evening with. The top employee of the month gets to choose first. He likened it to a hostess bar - and accused managers of "preying on young men's sexual urges, to get them to compete and bring in more money"."
https://www.bbc.com/news/world-asia-68226271 ("North Koreans working in China 'exploited like slaves" (2024))