Hi-Fi Stores in Seoul, South Korea

Are there any high-end audio stores in Seoul, South Korea? My dad is going there on a business trip, and I was wondering if certain audio products might be cheaper over there, specifically the Shelter 501 mk II cartridge. I know the Shelter is a lot cheaper in Japan.

So... any recommendations as to good high end stores in Seoul? Ability to speak English is not a requirement.

Thanks!