How important is South Korea for America?

https://www.quora.com/How-important-is-South-Korea-for-America/answer/%E6%A1%91%E7%94%B0-%E5%81%A5%E5%8F%B8-Kuwata-Kenji?prompt_topic_bio=1

Maybe the United States will give up on the Moon government.

When the United States withdraws from S.Korea, US will collapse Korea's economy.

The United States gets along well with North Korea.

And North Korea will direct missiles to China.

This is a hypothesis.