Does this "ethnic" refer to "a person from a minority" not in racial sense?
12)These days, Hollywood is welcoming more and more young Korean-American actors into the casts of its blockbuster movies... But Yoo isn't the only ethnic Korean enjoying recent fame...
I thougt about it, the first meaning that came into my mind was also "racially, by nationality", but this definition only in Korean says it can sometimes mean "a person from a minority" as a noun form. Yes, that was not a noun but an adjective, but I was a little bit confused.
ethnic : ??? ????
(특히 美) 소수 민족 출신자
They have an "ethnic food" aisle in the supermarket, where you may find specialties from Mexico and the Middle East and Asia, etc. There "ethnic" would refer to a minority status, these items are not as popular or known of as are the items in the other aisles in the store.
But in your context it clearly means someone whose heritage is Korean.
Here are some minority groups in Australian society - men, amputees, high income earners, Koreans, cat owners, dentists... Only one of these minorities could be referred to as 'ethnic'.