Why do both North and South Korea remain in a state of heightened military readiness?

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Both North and South Korea remain in a state of heightened military readiness in order to revert back spontaneously during attacks and save themselves from huge damage due to inactivity.

Explanation:

The state of heightened military readiness is said to be when the forces are fully prepared for any unforeseen circumstances. This increases the reacting efficiency of the forces when provoked. The Korean War led to the separation of North Korea from South Korea.

The military in North Korea is 4th largest military in the world. Both North Korea and South Korea are prone to sudden attack hence they are always in a state if heightened military readiness.