Begonia Luzonensis is a species begonia from Philippines specifically from Luzon. It has similar characteristics like Begonia Martin Mystery, the leaf formation and plant structure also seemed to have more of a hardy characteristics in comparison to most begonias.
This one have an oval shaped foliage with dark green vein appearance with silvery tones on the full foliage surface. There are however many different variants with these similar characteristics with this type - hence Philippines happens to have 133 unique begonias species which are endemic in their region some endangered but mostly been proposed for a conservation status.
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Here is the link where I had put together a list of all the begonias that I had come across.
A database of all the different types & their characteristics.
Please click on the link on the title above for the post.