The credit here doesn't go to South Korea's government but to a company called Seegene and it's CEO Chun Jong-yoon who directed the company to focus on COVID-19 testing on January 16th. They are the reason South Korea's CDC was able to ramp up 118 labs so quickly. It's making about 10,000 test kits a week and has been at the center of South Korea's testing strategy.
The market is better at addressing problems than government and if the FDA and CDC hadn't gotten in the way in the US, our testing response would have been far better.
Seegene's kits test for all three marker genes and aren't even available in the US because it doesn't yet have FDA approval. At least 30 other countries are placing orders for Seegene's kits.