We once thought the Ghostly Gates were a disaster and the vengeful spirits our enemies. Only after Lu Zhao crossed the final door did he discover that the truth was far more brutal than anyone imagined. The terrifying beings pouring out from behind the doors were merely the universe's "cleaners," sent to eliminate a form of civilizational pollution known as "spiritual entropy."
And every trace of negative emotion born from humanity's fear, hatred, and greed is pushing the entire species closer to extinction.