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One day, Chen Qi was taken back to his junior high school days by a mysterious man from the future. In this reversal of time and space, Chen Qi has to accept a task: to protect a person who plays a decisive role in a certain technological process. The purpose is to start this key technology in advance to avoid the end of mankind in the future. The reason why humans in the future chose Chen Qi is because this key figure will experience a life and death crisis in high school, and at that critical moment, Chen Qi was the only person by his side at that time...

The story of an art student in the 1990s, the life history of a small person in the context of the big era.