Modern youth Li Tianlong accidentally travels to 1977, becoming Li Laowu of the Qingshan Brigade. Relying on his advanced vision and resourcefulness, he seizes the opportunity to enter the county film station as a projectionist. Taking advantage of rural touring screenings, he travels across various communes, enthusiastically helping relatives plan their ways out and resolving various difficulties for the villagers. He sets up mobile book chests to spread knowledge, assisting a crowd of youths in grasping the era's opportunity of the resumption of the Gaokao. Tempered by the trials of the era, he sheds his impetuosity, supports and is supported by his family, step by step growing into the most solid and reliable pillar for the entire family, forging his own world in the 1970s.