Up Knife Mountain, down into the oil pot.
In the Underworld, these are two of countless punishments.
Those who entered Hell after death were sentenced based on their behavior in life. If they were guilty, the punishment depended on the severity of their sins, and only when their sentence was complete could they be reincarnated.
Naturally, if they were good people in life, they might enter the Heavenly Court to serve the real Immortals of the Immortal Rank, or some with martial prowess could become Heavenly Soldiers.
Within the Underworld, Sun Wukong had long been familiar. After learning what he wanted to know, he left the City of the Wrongfully Dead and headed for Knife Mountain.
A mountain bristling with knife edges, countless wronged souls were driven to walk atop Knife Mountain, their screams incessant.