It's also titled "The Great Doctor" and is available on KoCoWa and it's available on Viki in my region which is the United States. I'm a VPP member.
I've purchased many excellent quality dramas and OST CD's from YesAsia, based in Hong Kong. But make sure if you do order that you select a product that's designed for your region, ie. DVD Region 1, 2, or 3