@Teresa473
If your government has a mandatory 14-day quarantine requirement for all incoming international travelers, I'm sure the government would have something in place rather than *assume* people will self-quarantine and let them all enter the country.
S.Korea also has a 14-day mandatory quarantine and in case of foreigners without a permanent residence in Korea, they are required to fulfill the 14-day quarantine in a government facility at their own expense. I've been told people are asked to sign an agreement before boarding a flight.
http://overseas.mofa.go.kr/nl-en/brd/m_6971/view.do?seq=761545