The Chosun Ilbo is reporting that many North Korean defectors eventually turn to crime to make ends meet in South Korea:
The number of crimes committed by North Korean defectors in South Korea is rising dramatically. The offenses range from real estate and insurance fraud to drug dealing and the sex trade, and the victims are often other North Korean defectors.
The number of defectors is expected to reach 25,000 by the end of the year.
According to the [South] Korean Institute of Criminology, 899 defectors were nabbed between 1998 and January of 2007, accounting for 10 percent of the total 8,885 living in the South until that time. The crime rate among defectors is more than twice as high as the country’s overall rate of 4.3 percent. [Chosun Ilbo]
You can read the rest at the link, but the number of defectors that turn to crime is probably inflated because according to the article 30% of North Korean defector women turn to prostitution for a living. Yes 30%! Since most defectors are women and prostitution is technically a crime in South Korea this is probably why the crime rate for defectors is so high.