The vast majority of ESL teachers in Korea teach at private schools (referred to as “hagwons”). https://bgbbs.com/%EC%97%AC%EC%84%B1%EC%9D%84-%EC%9C%84%ED%95%9C-%EC%95%8C%EB%B0%94%EC%86%8C%EA%B0%9C%EC%86%8C-%EA%B5%AC%EC%9D%B8%EA%B5%AC%EC%A7%81%EC%9D%98-%EC%B5%9C%EC%A0%84%EC%84%A0%EC%97%90-%EC%84%9C%EB%8B%A4/