The film adopts a cross-time and space perspective and a chapter-like structure to look at the historical period of the group's 100-year history, showing the pulse of youth in different eras and different regional backgrounds. The film is divided into five chapters: "Echo", "Stars", "Light", "Listen" and "Hot Snow". It extensively explores the struggles of youth groups in each era, and selects images of young people from different eras and identities such as "underground Communist Youth League members", "second generation astronauts", "entrepreneurial college students", "support teachers" and "Beijing Winter Olympics service support personnel". From the sacrifice of one's life to save the nation to the thorny road of the aerospace industry, from the courage to be the first in reform and opening up to the responsibility of targeted poverty alleviation, the enthusiasm and kindness of young doctors... Chapter 1 "Echo" The story takes place in the Harbin Harmonica Club, a special left-wing cultural position in the history of the Northeast Anti-Japanese War. The Harbin Harmonica Club used "Dehui Foreign Trade" as a shield and was responsible for secret contacts, development of party members and league members and other organizational activities. In the early spring of 1936, due to reports from traitors, the secret service set up a search trap using the "Guoguang" brand harmonica as bait. The secret service arranged for an "uninvited guest" to pretend to be the contact person of the harmonica club, staged a "thief shouts to catch the thief" drama, and mistakenly targeted the rich girl Du Roujia who came to pick up the goods. At the critical moment, Lao Shen discovered in time
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