I recommend the Gyeonghee Oriental Medical Clinic in Ganghwa, Incheon.

I recommend Kyunghee Saebyeok Oriental Medicine Clinic, located on Ganghwa-daero in Ganghwa-gun, Incheon. My grandmother goes there once and has been going ever since. The director is very friendly. The yellow sign and stickers make it easy to find. They also offer regular treatment on Saturdays and say the treatments are effective. They even have a 5.0 rating on Kakao Map.