I recommend Dongtan Seongmo ENT Clinic in Yeongcheon-dong, Hwaseong City.

This is the hospital my wife always goes to. Haha.

The only downside is that I have to wait over an hour every time I go, but it's a hospital everyone in the neighborhood knows. Haha.

My wife, who constantly suffers from colds, allergies, and rhinitis, goes to the hospital very often. Haha

If you live nearby, be sure to visit. Haha