What will happen if North Korea bombs South Korea and Japan with nuclear weapons?

North Korea hits Korea and Japan → the United States hits North Korea → China and Russia intervene.

At this point, there are two possibilities:

1. Korea was occupied by China and Russia, and then a pro-China-Russia capitalist government was established (because in fact both China and Russia are capitalist, but one is a one-party system and the other is a multi-party system). The United States has a large number of troops in South Korea.

2. Sino-Russian-American conflict → a brush gun went off → a world war → a nuclear war → the population of human beings has dropped sharply, and the reconstruction of human civilization has become the top priority. Humans have abandoned racial differences and realized productism (of course, the most likely is human extinction).