An engineer from 2073, born in the 1980s, Lin Ye was ninety years old. He had once used fifth-generation Neuralink brain-computer interface technology to eliminate the lesions caused by Alzheimer’s disease. At the appointed time, he went to the Tianqi Biotech Company to take part as Volunteer 001 in an experiment implanting the Kunling AI biochip. An accident sent his consciousness back to his six-year-old body in 1990. The story is mainly about the protagonist as he relives historical events: What choices will he make, and what will he seek in life? Money, power, profit, or the pursuit of his true self? If you could start your life over, what would you do? Perhaps this book can gradually help you discover some of the things you’re striving for. That is also why I began writing it.