At the beginning of 1973, the third-line construction was in full swing. Deep in the mountains of a northern province, a number of new employees were welcomed after the expansion of the small third-line factory code-named "748".

Lu Xiaoqing, Zuo Hongwei, Ding Yaling, Li and Zhao Cungen, who are in their prime of life, are outstanding among these apprentices, both in appearance and work ability.

In the most glorious years of "748" factory, several young people experienced the test of friendship, the baptism of love, the competition of work and the confusion of life.

In the eventful years of decades, I have United and helped each other, pursued my dreams and changed myself. Experienced emotional entanglements, ups and downs of fate and changes of the times. I wrote a youthful and energetic song with passion and blood. From youth to late spring, Lu Xiaoqing dedicated the best time and youth in his life to the "748" factory, witnessing its glory, decline and rebirth until he retired from the historical stage.