The literal translation of the title of this movie is: Female Group.
This movie is a much better movie than Nie Yuan (1995) in that it is an accurate depiction of Chinese prison. For example, this movie accurately depicts the fact that the Chinese jail systems in which female prisoners are in different jails from the male prisons, not the mixed prison such as the fake in the movie Nie Yuan (1995).
The second example of this movie honestly reflects the real life is that a female warden is in charge of female prison, the standard practice in China, not the fake story of a female warden in charge of male prisoners like in Nie Yuan (1995).
If you want to take a peek of what Chinese prison system is like today, avoid Nie Yuan (1995) at all cost, choose this movie instead.