I kinda discovered this piece in the same way. It was preset in my digital piano, and I couldn't find out what it was.
Months later I went to a concert and I heard it. And I had to grin because it was Chopin. I already loved Chopin, but this kinda made it a fact that, even if I don't know it's his, I still love the style.
(Although Chopin hated this piece. He wrote it at around the age of 22, but it's only published after his death)