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There is a system! Play time travel! It's always fun to travel through time! (Time travel, system, metaphysics, future technology, doomsday, panic, history, comedy, youth campus, military department!) Li Yilu obtained the system and enjoyed the first time travel treatment. After returning to reality, she was suddenly exposed due to system reasons! Then the trusted people know about it and start enjoying every time traveling process! Li Yilu, Quanzhou and Chen Xueer! In class, through history essays, you instantly become famous in the class! The next three people travel through various worlds! Enjoy the changes in the world! From the beginning of the world to where we are today!