The film adopts a cross-temporal perspective and chapter-style structure, looking through the historical period of the 100th anniversary of the founding of the League, showing the youth pulse in different eras and different regional backgrounds. The film is divided into five chapters: "Echo", "Stars", "Light", "Listen", and "Hot Snow". It widely explores the struggle of young groups in each era, and selects young people of different eras and identities such as "underground Communist Youth League members", "second generation of aerospace people", "entrepreneurial college students", "teaching teachers", and "Beijing Winter Olympics service and support personnel". From sacrificing one's life to save the nation to the arduous journey of aerospace, from the pioneering of reform and opening up to the responsibility of targeted poverty alleviation, the passion and benevolence of young doctors... Chapter 1 "Echo" The story takes place in the Harbin Harmonica Society, a special left-wing cultural position in the history of the Northeast Anti-Japanese War. The Harbin Harmonica Society used "Dehui Foreign Company" as a shield and was responsible for secret contacts, developing party members and league members and other organizational activities. In the early spring of 1936, due to a traitor's informant, the secret service set up a search trap with the "Guoguang" brand harmonica as bait. The secret service arranged an "uninvited guest" to pretend to be the contact person of the harmonica club, staged a "thief crying catch thief" drama, and mistakenly pointed the spearhead at the rich girl Du Roujia who came to pick up the goods. At the critical moment, Lao Shen discovered the conspiracy of the spy in time, and by playing the music, the "uninvited guest" revealed his flaws and cleverly resolved the crisis. Through this experience, Du Roujia also strengthened her determination to join the Harbin Harmonica Club and fight with everyone. Chapter 2 "Stars" In Dongfeng Aerospace City in Jiuquan, Gansu, 19-year-old girl Liu Fanxing moved to the family area of "District No. 10" (Dongfeng Aerospace City) because her father was temporarily transferred to the Aerospace City for work and lived in the Liang family. She became friends with the lively and sunny Liang Wanhu because of music, and met Lu Xuelin, a teenager who loves physics and astronomy. In order to fulfill her promise to her father, Liu Fanxing needs to find a radio that can receive a specific frequency to listen to the "song from the universe." So, she, Liang Wanhu and Lu Xuelin, embarked on the exploration of making semiconductor radios. Through continuous attempts, they collected materials such as diodes, triodes, capacitors, resistors, semiconductor materials and transistors, and successfully made semiconductor radios. Coincidentally, the Dongfanghong-1 satellite was launched, and their radios emitted a buzzing sound, "the sound from the universe" - "Dongfanghong" broadcast by the rocket in space. In the process of making radios, Liu Fanxing, Liang Wanhu and Lu Xuelin continued to grow, and at the same time witnessed and inherited China's aerospace industry and aerospace spirit. Chapter 3 "Light" In Guangzhou in 1984, college graduate Chen Guang came up with the idea of establishing a light night market to prove himself to his girlfriend Lin Meng and her father. In order to light up the night market, Chen Guang repaired the lights dangerously in the rainy night and overcame difficulties. Lin Meng was also moved by him and decided to help him. Finally, everything was ready. So Chen Guang pulled the wires, Lin Meng attracted customers, and the two tiger brothers called the stall owners. The lights in the alleys were lit, the stalls were selling, and the people patronized. When it was busy, the lights of the whole street suddenly went out. Lin Meng's father called a halt as the street director. A customer lit up a flashlight, and neighbors went downstairs to light lanterns and candles, making a sound that a night market was needed. Lin Meng's father was moved by the efforts of Chen Guang and others and the support of the people. Two weeks later, through the suggestion of Lin Meng's father, the government specially planned a road to hold a night market. Chen Guang was finally recognized by Lin Meng's father, and the first night market in China was officially opened. Chapter 4 "You Listen" Teacher Zhuang, who came to a rural primary school in Yunnan to teach, gathered children who love music in the village to form a newnine (milk) band for a music competition. Teacher Zhuang popularized his musical concept of "harmony between man and nature" to the children, and took the children to get close to nature. During the rehearsal process, each child gained his own growth. They rehearsed together and experienced many tests. The team spirit was slowly condensed in this process. Just when the band was facing the dilemma of not being able to catch up with the auditions, the newnine band worked together with the villagers to turn the simple cowshed into a warm livehouse, and successfully uploaded the singing video through the online track. Chapter 5 "Hot Blood" In order to prepare for the 2022 Beijing Winter Olympics, China has formed a team of ski doctors. Young intern Ma Hao, together with experienced mentor Lao Yang and other doctors, went to Zhangjiakou Wanlong Ski Resort to participate in the training of ski doctors for the Winter Olympics. Ma Hao had a strong shadow on skiing because his father had an accident while skiing when he was young, so he chose to stay in place. During the skiing process, doctor Lao Yang suddenly had a heart problem and had an accident at the ski resort. At the critical moment, Ma Hao remembered the guidance and encouragement from Lao Yang and his father, overcame many years of psychological barriers, and with excellent skiing skills, he arrived at the scene of Lao Yang's accident as soon as possible to start treatment and strive for precious rescue time. Through this rescue experience, Ma Hao not only overcame the shadow of skiing in his childhood, but also more clearly realized the connotation and significance of "doctors' benevolence" in the Olympic arena. In 2022, after four years of training, China's first ski medical support team appeared in the Beijing Winter Olympics. They stayed at their posts and successfully completed every emergency rescue mission.