In a response to CNBC, Seung-ho Choi, a deputy director at the Korea Disease Control and Prevention Agency said that up to 80% of “imported confirmed cases” in South Korea are coming from China.

Choi said the number of people traveling from China who tested positive for Covid-19 went up 14 times from November to December.
Choi also said that its policies cover “all Korean nationals and non-Korean nationals coming from China. This is not confined only to Chinese people. There is no discrimination for nationality in this measure.”
https://www.cnbc.com/2023/01/11/south-korea-covid-rules-not-discriminatory-to-chinese-travelers.html