Reborn 2009 Mobile Phone

The programmer dug out a letter from the corner that he had buried when he was young - it was a joke he wrote to his future descendants, asking them to take a time machine to pick him up. I didn't expect that this letter would really span time and space and correspond to my children twenty years later. Every time the future is changed, the identities of the children will change - Li Xinyan, Su Xinghe, Su Lingxiao, Su Nianchen... They come from different timelines, but they all have the same purpose: to pass future technology back to the past. From gene therapy to antimatter energy, from warp engines to the remains of alien civilizations, human technology is advancing rapidly in one iteration after another. The price is that the children of every timeline will be wiped out in the war against the third-level civilization. Su Chen looked at the letter and finally understood - this was not one person's counterattack, but the entire human civilization using countless timelines to fight a battle of survival that was destined to be destroyed and destined to come back again. (No system)