We also have strong reason to believe that south korean figures are a gross underestimate (if you read the linked wikipedia article). Victims have a hard time

We also have strong reason to believe that south korean figures are a gross underestimate (if you read the linked wikipedia article). Victims have a hard time coming forward if there is a strong possibility of being victimised again (korea has a long history of blacklisting victims families for generations, it's not just a north korean thing).