Lin Yimu and Xu Zhiguang were once sweethearts in college. Their youth was filled with memories of paper airplanes, guitar music, and sunsets glowing in the evening sky. But fate tore them apart, and for ten years they heard nothing from each other. When they met again, it was only a fleeting glance amid the crowds. He had shed the impetuousness of youth, while she had hidden away her youthful longing. The words “What you can never forget will surely find an echo” became a thorn in her heart, and the silence after their reunion hurt more than being strangers. As the past resurfaces, can they reclaim the courage they lost to time, or will they become nothing more than old dreams, lost to each other beyond ten miles of spring breeze?