The cultivar, Jin Xuan (Taiwan Tea #12), is a Taiwanese invention. It has become popular across Asia for it's high yield and creamy taste. This is the original Milk Oolong, without any artificial flavoring added.
Sampled this on A Visit to Floating Leaves. Quite a nice tea, a great example of a milk oolong from Nantou, near where Baozhong Farmer's Choice is harvested I guess.