Which of the two Korean currency are we looking at here? KPW or KRW?

Catch 22
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If you are talking about the South (KRW); Congratulations, as Philip says, you may just be in for some luck. But Wait! That amount is slightly above 500/=. Is it worth the  trouble I foresee?

If you are facing North; that's over 4K! Tidy sum huh! But then, with the isolation accorded to Pyongyang, you only stand an ice-cream-in-hell chance to get that loot converted locally. You'll probably have to explore some Chinese connection with this.