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Since the moment he was born he felt he was different. Born from a woman that had transferred from the world of humans into the world of beasts alongside her husband while being pregnant, the moment he was born he didn't cry.
He only looked around in silence. In those ancient times where humans only lived in tribes within the beast world, surviving in the harshness of the nature of this world, he was seen as strange.
His parents thought he was sick, or that he would die soon, but he remained calm and composed, and incredibly healthy. The boy never cried, nor even complained about things.
It only sought knowledge like a magnet, finding things interesting and experimenting with them. His parents felt no longer worried and treated their curious and intelligent son as a genius amongst geniuses.
Check "The Protagnist's Sister Is Actually the Strongest"!