Plastic surgery, dermatology, and even dentistry. Don't go to places that only have foreigners and no Koreans.
 
How can foreigners come here? They didn't come to their home country because they were good at it by word of mouth, but the company that signed a contract with the hospital sent foreign patients to them, and even the interpreter was, in a word, a broker. They were ignored by Koreans and maintained the hospital by attracting foreign patients. This is illegal under the medical law.
 
I went there, but if there were only foreigners, they would just leave.