1. After World War II, it was bounded by the 38th parallel, but the maritime direction of the 38th parallel was controversial. North Korea thinks it should go south, and South Korea thinks it should go north. This is a disputed sea area. 2, South Korea is rich but not rich, the United States actually controls South Korea, and military bases occupy Korean ports and traffic arteries, which is spineless; North Korea is poor, has backbone, missiles and nuclear weapons.