“In the event of war, North Korea’s plan is to use overwhelming firepower and speed of action to conduct a ‘One Blow Non-Stop Attack.’ In 1992, Kim Jong-il, the father of current leader Kim Jong-un, concluded that only a lightning assault across the border, known as ‘Occupying South Korea, All the Way to Pusan, in Three Days’ could succeed in light of the overwhelming firepower that U.S. forces could bring to blunt any of Pyongyang’s moves.”
Source: In the Next Korean War, the DMZ Will Become a Total Death Trap | The National Interest