score:4
Per TIMATIC, regarding transit in South Korea:
Admission and Transit Restrictions:
- Passengers arriving from China (People's Rep) must have a visa issued by Korea (Rep.) to transit through Korea (Rep.).
VISA NOT REQUIRED.
Warning:
Passengers who have been in Bangladesh, Kazakhstan, Kyrgyzstan, Pakistan, Philippines or Uzbekistan in the past 14 days must have a medical certificate with a negative Coronavirus (COVID-19) PCR test result issued at most 48 hours before departure. The certificate must be in English.
Flights must arrive at Incheon International Airport (ICN) between 5:00 and 20:00.
As such, you're good.