There is a Kwak Internal Medicine Clinic in Changseong-dong, Jongno-gu.

It's about a 500-meter walk from Gyeongbokgung Station in Jongno-gu. It's a bit far from the subway station, but there's a bus. The director is a woman, slightly older than middle age. She speaks gently and devotes her time to providing excellent care. Perhaps because there aren't any internal medicine clinics nearby, there seems to be a steady stream of patients. They also offer health checkups, so if someone is performing an endoscopy or ultrasound, you might have to wait a while. Still, it's a very friendly hospital.