Generally speaking, it is a product of the Cold War.

After Japan surrendered in World War II, according to the Tehran Conference, the Soviet Union stationed troops in the north of Korea and the United States stationed troops in the south of Korea. However, due to the beginning of the Cold War, Korea was divided like Germany. On August 15, 1948, the Republic of Korea was announced under the arrangement of the United States. Less than a month later, on September 9, 1948, Kim established the Democratic Republic of Korea with the support of the Soviet Union. Neither North Korea nor South Korea (I always like to call it that) recognizes the other, and both insist on unifying Korea on their own side.

The first country that couldn't help it was North Korea. On June 25, 1950, North Korea's 7th Guard Brigade launched an attack on South Korea's 17th Army Regiment (some say South Korea took the lead in launching an attack on North Korea), and almost unified the entire Korea. However, as soon as the United States sent troops, South Korea reversed the situation and almost unified the entire Korea. Finally, China sent troops and took North Korea back.

So in general, the conflict between North and South Korea is not just ideological, but more importantly, they are still concerned about who will unify Korea. $BTC