There are many viruses which can affect the respiratory system (throat, lungs)
Depending on how bad the virus (bad means ability to cause bad to you) is and how good your immune system is and the number of viruses attacking you
1. Virus is killed by your immune system (if the virus cannot cause bad to you, less virus comes, you have good immune system) and it cannot go out of your nose or mouth
2. Virus comes and gets away unharmed
4. Virus comes, gets multiplied, spreads to others from you and damages your throat only (Sore Throat )
6. Virus comes, gets multiplied, spreads to others and damages your lungs a lot (ARDS - Acute Respiratory Distress Syndrome)
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Now
It is not just the CoVID19 which causes these
In Short
Even if you are COVID19 Negative, you can still develop Sore throat, pneumonia, ARDS, MODS or die due to any of the virus
If you have any cough or sore throat the focus should be one preventing it becoming pneumonia. Testing for CoVID19 does not help
If you have any pneumonia the focus should be one preventing it becoming ARDS. Testing for CoVID19 does not help
If you have MODS the focus should be one preventing killing you. Testing for CoVID19 does not help
So
Don't blindly believe media reports
Use your common Sense
It could be because
1. The virus which went there itself has less capacity to do bad
2. Koreans had good immunity (because they vaccinated themselves in huge numbers)
3. There is something in their genes which repels this virus
5. There is something in their food which gives them immunity
6. Their climate is TOO COLD for the virus to spread
(Any Virus spreads in a temperate range. Too hot or too cold can kill it)
8. Sea Air protects
9. Their use of Centralised Air Condition is less
10. People there are less ignorant and less arrogant and they trusted their govt and followed the protocols
11. They tested more
12. Any other reasons
Korea has less mortality could mean any of the above reasons
To Ignore Everything and say "test" "test" means
1. You don't know about epidemics
2. You read wrong information
3. You are related to the company which sells testing kits
So
Treat Pneumonia First