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A dream opens Xu Fan's different life. Life pursues beauty, wisdom pursues truth, and civilization pursues eternity? No, this is just a story about the development of civilization. The development of civilization is interconnected. If there is a problem in any link, what awaits people is destruction. When a butterfly flaps its wings, it seems to be a simple thing, but it ends up pushing humans into the abyss. Face it? Or escape? Is it a struggle? Or give in? It all started when Xu Fan sent those dozen letters...