The background of the story is China in the 1980s (specifically, it can be set around 1985), an era that was relatively lacking in material resources but full of vitality and simplicity. In the early stages of the transition from a planned economy to a market economy, food stamps and cloth stamps were still in circulation. The work unit system was the mainstream of society. Neighborhood relations were close. Information dissemination relied on newspapers, radio and word of mouth. There was a huge gap between the level of science and technology and that of the 21st century.
The male protagonist Zhang Wei accidentally traveled here with a smartphone that had limited power and was unable to connect to the Internet but stored a large amount of information (offline music, videos, photos, e-books, memos, etc.). The mobile phone became his only bridge between the "past" and the "future". It was both his "golden finger" and a secret that needed to be carefully hidden.
