The Battleship Island (2017)

WW2, prisoners on a remote island, wrongfully imprisoned, abuse of power

War happened during japanese colonial and how woman and kids was forced to be sex slave. How they try to survive and sad story behind it.

Both are war films about people fighting back against the Japanese occupation in the twentieth century.
Both have large amounts of violence and gory with many fatalities

Apparently, i can speak looks like it is not about japan korea history but after watching half of the movie you will see that the old woman is actually a rescue woman from japan brothel (jail) where the japan military do bad deeds to women. But you will enjoy the movie as the second half is really heart breaking piece.