If North Korea attacks the South, it will be the end of North Korea. The North Korean Army is largely a farce. It is a WW2 trained and equipped force which will have to deal with a fully modernized South Korean Army equipped with the latest Western technology.
There is another comparison that I want to mention.
North Korean Army
South Korean Army
Look carefully at the two pictures above. Look at the faces of the men in both.
The faces of the North Koreans are all emaciated.
The faces of the South Koreans are all well filled out.
The North Korean Army can not even feed itself on its bases. There is no possibility that it could feed itself on the battlefield. With what?
North & South Korean Armies Compared