Why this country has no corona case|पूर्वी एशिया का यह देश कैसे हुआ करोना मुक्त ? क्यों नहीं है इस देश में करो ना के एक भी मामले।How made North Korea Corona Free

Cases of corona virus infection are increasing rapidly around the world, but North Korea is a country where even a single case of Kourna has not been registered and has been fully recovered. So North Korea has become a corona free country at this time.