Conquer the World Starting from the Destruction of the Pillars

"I think that ghosts should not be driven out to death, but should be captured and studied to find the secret of their immortality. Human beings will overcome the weakness of short lifespan, have unlimited time to conduct scientific and technological research, and then rush out of this planet until they conquer the universe." Qi Xuan travels through worlds, descending, conquering, and progressing... The tentative titles include Hashira Slayer: Kimetsu no Yaiba (Demon Slayer), Under One Man, White Snake: Origin... And will be added later based on the plot.