South Korea has already tightened admission requirements for people from China. From Monday January 2, South Korea started mandating a PCR test for visitors from China.
South Korean nationals and foreigners with residency status returning to SK after visiting China must quarantine at their residence following a PCR test, must remain in separate facilities until their test findings are confirmed.
Starting on Thursday, visitors from China must present proof of a coronavirus antigen test or PCR that is negative before they arrive.
- will also require arrivals from Hong Kong and Macao to test
Info comes via Yonhap, link here for more