Hundreds of thousands committed by DPRK during the war. http://m.monthly.chosun.com/client/news/viw.asp?nNewsNumb=200302100069
Just to be clear, S. Korea and the UN/US also committed war crimes, I’m not denying that.
As for what goes on in the DPRK since the war, not sure what sources I can offer that you will actually believe. I readily admit that the US is guilty of crimes against humanity at home and abroad. Can you say the same for the СССР, Russian Federation, PRC, DPRK, etc.?