I have both shade #white and shade #one, though I bought shade one from Amazon.

Shade white is more fluid and runny, which makes it great for lightening foundation shades or adding a subtle brightening effect. It also leaves a soft, glowy finish.

Shade one, on the other hand, has a creamier, thicker texture. It doesn't run when pumped out and blends into the skin with a natural satin finish. I haven’t worn it alone long enough to test its true longevity, but with a fixing spray, it lasts all day without breaking apart.

For Korean base shades, I’d say shade one is similar to a #23.