I have both shade #white and shade #one, though I purchased shade one from Amazon.
Shade white has a more fluid, runny consistency, which makes it perfect for lightening foundation shades or adding a subtle brightening effect. It also gives a soft, glowy finish.
Shade One, by contrast, has a creamier, thicker texture. It doesn’t run when pumped out, and it blends into the skin with a natural satin finish. I haven’t worn it alone long enough to test its true longevity, but when I use a fixing spray, it lasts all day without breaking apart.
In terms of Korean base shades, I’d say shade one is close to a #23.