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[Respect the original work, dig deeper into the plot, and expand your imagination. ] The lighthouse travels day after day according to the route that has been set long ago, but it does not know that the outside world has undergone earth-shaking changes. When the old humans begin to suck the essence of life, they will mutate into bloodthirsty and crazy beast-humans. Only by surviving this level can they be reborn from the ashes and evolve into powerful new humans. On top of the new humans, there are alien humans who can control water and fire... What is the end point of evolution?