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Cai Baiyang, a job-seeking man, accidentally traveled back to the Republic of China and found an awesome job - building a subway. With a mobile phone with Internet access, he prospered in the Republic of China and met three people at work: Satoshi Nakamoto, a middle-aged cyberpunk, Xu Wenjun, a smart and upright girl from the Republic of China, and Fei Geer, a quiet and taciturn girl. One of them is a cryptography expert from modern times, one is a talented student in the Department of Architecture of Jinling University, and the other is the daughter of a tribal chief who traveled from prehistoric Yangshao civilization. The four people have different identities, but they became colleagues in the Republic of China in 1927 and gradually became familiar with each other. A love and hatred that spans thousands of years, along with the chaotic timeline, is narrated...