While Others Cultivate, I LVL UP In My Sleep Using The Dungeon System

It all began with a poor orphan who would work every day for long hours to pay for his Aunt's medical bills.
When his life begins to fall apart and he is homeless sleeping in an alleyway he hears a robotic voice.
{Do you wish to integrate with the Dungeon System}
"Yes" he answers, without much to lose.
And from then his life had never been the same.
He was taken into a dungeon each night to hunt and he began to realise just how little he really knew about the world that was much wider than he thought.