Camera I will give you the following advice.
Please check the timeline of events. South Korea had a agreement with the US to not seek any Nuclear weapons in 1974. It joined the NPT in 1975. In 1992 it hold joint talks and issued a declaration with the DPRK regarding enrichment and reprocessing (Both Koreas banned the said processes voluntarily).
Then in 2004 the IAEA set up an inquiry regarding the ROK, it found discrepancies but was compelled to call them in other terms such as not to raise a fuss at the UNSC.
http://carnegieendowment.org/files/i...pro_regime.pdf read page 12.
I'm not even going to deal further with you. Either check your facts either I desist from argueing.
The situation with Iran is completely different. Time and again I see that your bias stop you from discussing this issue in an intelligent manner.