After Qin Shihuang unified the six kingdoms (approximately 221 BC - 210 BC), the world was initially settled, but undercurrents were surging - the remnants of the old aristocracy were waiting for an opportunity to restore the country, harsh government and corvee caused public resentment, incidents such as Xu Fu's eastward journey and seeking immortality and medicine occurred one after another, and the centralization of power and local conflicts were sharp.
