There are no ghosts in this world. The reason why the dead can return is that someone injects a new soul—or more accurately, data—into their corpses, attempting to achieve the goal of reanimating the body.
Lin Shen could understand this. The predecessor to the Star Constellation Sea, the Six Paths Reincarnation Institute, was exactly such a place.
What truly shocked Lin Shen was when the Jade Bone Demoness mentioned that the so-called ghosts were experiments conducted by the Celestial Court. They injected artificial intelligence into human bodies, intending for AI to acquire human physical forms.
Ghosts were AI injected into corpses, while immortals were AI injected into living bodies, aiming for the AI to replace human souls and seize their bodies.
Unfortunately, the experiments were unsuccessful. While soul exchanges between humans could be easily achieved, injecting AI into a living body rarely succeeded in replacing the human soul.