Some physicians and hospitals will not accept overseas health insurance and therefore may require you to pay up front; however, if you or your employer pay taxes then you are entitled to health insurance through your employer
no vaccinations are required to enter South Korea, but you should be sure your rabies and tetanus/diptheria shots are up-to-date, and vaccination for hepatitis
Korean-made drugs are generally safe, sanitary, and inexpensive—even without insurance. They are available in pharmacies like those in the United States or Canada.
Some treatments require that you go to a clinic for a shot and medicine every day for a week or more. Should you need to visit a doctor, bring a Korean friend with you to ask questions.
Winters are usually long, cold, and dry, whereas summers are short, hot, and humid. Spring and autumn are pleasant but short in duration. Seoul's mean temperature in January is -5° C to - 2.5° C; in July the mean temperature is about 22.5° C to 25° C.