Can you give us any more information? Did you sow a seed? Plant a tiny 'bulb'? Where did it come from? Location, climate etc. What is the underside of the leaves like? Can you give us an in focus view?
From the leaf it could be a cyclamen but it's not a newly sprouted cyclamen seedling since they have a single leaf and no visible corm to start with. May be a one year old baby cylamen corm?

I'd second the Cyclamen choice. If a seed pod gently drooped into the pot-next-door it would be easy to miss - particularly if you had stashed this pot in the picture to wait for a slow-geminating group of seeds.

Or Haemanthus...

No, this is not a Ciclamen.

The plant was obtained from seeds ... two years ago. Last year a snail ate only leaf...came a year ago that these two leaves of the bulb but the plant does not advance, is very slow to develop.

Could be a Ceropegia ????

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That's a serious possibility! What did you plant? C woodii's tuber is often a dark reddish brown so I'm guessing it's not that.