This is a stupid take in the Washington Post:
Rep. Song Young-gil, chairman of the ruling Democratic Party of Korea (DPK), Wednesday, struck back at tweets by a Washington Post columnist saying that South Korea would be like Afghanistan if the U.S. forces leave the Korean Peninsula.
Korea Times
In addition, he added that Seoul needs to take advantage of the Afghanistan crisis to regain wartime operational control (OPCON) of South Korean forces from Washington.
On Monday (local time), Marc Thiessen, a former speechwriter for former U.S. President George W. Bush, tweeted, “If South Korea were under this kind of sustained assault, they would collapse just as quickly without US support. There’s virtually no American ally who could defend themselves without us.”
You can read more at the link, but the ROK military will fight and not capitulate like the Afghan government that was corrupt and unpopular. South Korea is a developed democracy with a first world military with equipment far better than anything North Korea has. There is no way the ROK military would abandon their posts and rush to Osan Airbase to cling to fleeing C-17’s.