
The majority of Asian WIP ("Women-In-Prison" for those not yet with the program) movies come from Hong Kong and Japan. I've caught a few notable ones from other Asian countries, such as Taiwan and Thailand, but not really from South Korea, which is disappointing considering the lovely talent pool they have always had there.
At right is Mina Asami gracing the video box cover of the 1983 film Female Prisoner: Caged!
from Japan's Nikkatsu Studios. As covered in this entry, Nikkatsu was the leading producer of pink films during the "roman" porn era.