Spa services (Seoul)

Hi

I am looking for a good spa/beautician in Seoul. I know that there are many businesses and small shops around for nails, massage etc but am looking for somewhere that does treatments like waxing and eyebrow threading at affordable prices. I am staying within Gangnam area in the city but am happy to travel by subway a short way.

If anyone knows of a place that does good treatments at reasonable prices (with English speakers if at all possible but not essential) I would be grateful to hear where you go.