I believe that Dave's PlantPiles are incorrect. It is the only source on the web that names Viola koreana as Viola grypoceras.
The leaves may not be an exact match all the time because as the leaves mature they change, from rounded to a kind of spade shape. That happens in all most all the Violas of this type.
Try a web search of Viola koreana and you will see your plant.
Try web searching Viola grypoceras and only DG calls your plant by that name, not all those people in Japan and Korea could be wrong, especially since it is a native to that region. There are over 120 images that come up and only 3 that show a green/white leaf, they are on DG. I doubt that over 115 others got it wrong.
Thanks for clearing up the fact that as the foliage matures it changes shape a bit. Mine have been growing for three years now so I forget what they originally looked like. That is why I take pictures of everything anymore.