Where can I get tested for sexually transmitted infections in Korea?

Public health centers (보건소) offer confidential STI testing that's free or low-cost, and urology clinics (비뇨기과) and OB-GYN clinics (산부인과) also test. It's confidential, and whether through NHIS or out of pocket the cost is modest. Clinics in areas like Itaewon and Gangnam are more likely to have English-speaking staff if that helps you feel comfortable.