Destiny awaits

A boy in his teenage years was suddenly isekai'd to a different world after dying or does he really died in that world, after being pushed on the train tracks, his soul and half of his body were isekai'd to that other world but neither as a noble nor a prince but as a peasant child ought to sold to the noble rich people,but what he doesn't know is that he is ought for greatness, will he be the villain? or the hero? it is for destiny to decide,