To get back on the topic, the US won the Korean War, saved the South from certain death, destroyed the North Koreans, then repelled a massive million man meat assault from the Chinese who aided the North Koreans in their unjust assault on the South in the name of Communist expansion.
If you believe Chinas only motive was territorial integrity, then Chinas assault on Seoul would indicate otherwise.
Today, South Korea is a prosperous nation and a close ally of the US. The US defense of South Korea was a just and righteous one and a clear strategic victory for the US and South Korea today.