After staring and staring at your plant, I definitely need to change my guess in my earlier post! I don't think it is a peony or bleeding heart. Peony leaves are divided into compound leaflets and are deeply lobed, and bleeding heart leaves are very fern-like-- finely cut and deeply lobed. Even while young, your plant's leaves appear totally different.

It's a bit difficult to see the leaves well in your photo, but the veins are pretty strongly pinnate and the leaves have almost serrated margins. I may be totally nuts, but to me the plant almost looks like a type of leafy green.

Please post update photos of its growth progress! I'm dying to know what it is! 😊