Yama: The King of Hell in the underworld. Due to his negligence, he opened a rift in time and space, causing thousands of ghosts in the underworld to escape and endanger the world. Later, he joined forces with Pluto to go against the sky, reverse time and space, and the souls dispersed into the three thousand worlds...
Su Jiuer: The ruler of the underworld, because he reversed time and space with the King of Hell, fell into a deep sleep. He returned again after a hundred years, and entered the three thousand worlds with the earth spirit Xiaobai to collect the scattered souls of the King of Hell...
Purpose: Su Jiuer travels through various planes to collect the three souls and seven souls of Yama