Qiao Tong and Xu Qingwu grew up in the same college and were inseparable. They never missed any important node of each other. They were together as a matter of course when they got to university. However, because of a quarrel, Xu Qingwu went abroad in anger, and the two sides entered the Cold War. Their story in the future is unknown...
Concept: If longing is a scarf, then I must knit it very long