The story follows ten-year-old Huo Xiaoman, who spends his summer vacation at his grandfather Huo Da’s home in Yulin, Shaanxi. There, he befriends several local children from the countryside. Together, they form deep bonds of friendship and embark on adventures exploring air-raid shelters.

Three families living at the foot of the ancient city walls of Xi’an survive through old traditions and embrace the changes of the new era. In their own way, the different families struggle, adapt, grow, and finally find their way of happiness as the old walls become the intersection of parallel lives.