In the 1970s, in the third-tier region of the southwest, countless Shanghai people came to this barren land with lofty ideals to build the country and made great sacrifices. At this moment, the remnants of the Cultural Revolution are still there, and the chaos of state-owned units has not been eliminated. The teenager Wang Han (played by Liu Wenqing) who is studying in the children's school lives a carefree and happy life with Balatou (played by Zhang Keyuan), Little Mouse (played by Zhong Guoliuxing), Wei Jun (played by Lou Yihao) and several other partners. Wang Han's radio gymnastics movements are standard and he was selected as the leader. For this reason, he asked his mother (played by Yan Ni) to make a brand new white shirt for him. However, when he was playing by the river, his shirt accidentally fell into the water, and he accidentally encountered the murderer Xie Jueqiang (played by Wang Ziyi) who was chased by the police. Against the backdrop of the times, there are all kinds of strange phenomena that are puzzling. The little people can only go with the flow and can't help themselves...