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Rebuilding the netherworld is not something you can achieve just by moving your lips.
Firstly, the official functions of the netherworld, including rewarding the good and punishing the wicked, reincarnation, and so on, some functions are innate to the Yellow Springs of Jiuyou, while others require Yin Gods to take on the responsibilities, which need to be clearly divided first. For instance, reincarnation requires passing through the Six Paths Reincarnation Gate, which is an existing structure of the Yellow Springs of Jiuyou, so there's no need to worry about it. However, rewarding the good and punishing the wicked will have to be managed by dedicated personnel.
After clarifying the powers and responsibilities, we can then design the entire structure of the netherworld, and estimate how many Yin Gods, Yin Officials, and Yin Soldiers we need to keep the system running.
Then where do we find these labor forces?