Satan, the devil in the Bible (or Satan), is fallen angels of fallen angels who rebelled against the Lord. He used to be Seraphim before the throne of God, responsible for placing temptations on earth. Later, he degenerated into a devil and was regarded as the source of evil and darkness, not the power of light.
The boss of the underworld is Hades, and the underworld refers to the place where people live and die.
The leader of the underworld is Lucifer, a class opposite to God.
The leader of the holy world is God.
As upstairs said, it belongs to two places.