Jiang Chen first saw Luo Xiaotian during a break between classes. He inadvertently looked out the window to see the blue sky and white clouds and feel the sadness and anger suppressed by his high school life. However, he saw Luo Xiaotian at that glance. The blue sky and white clouds became the background, and he could no longer hold another person in his eyes. Many years later, he recalled that when they first met, he was still the 16-year-old boy in his heart, lively and independent of time, familiar street corners, familiar campuses, and familiar shadows. But everything no longer belongs to him, the stories and entanglements between the two people, the love that passes by, and the old dreams that are vulnerable. . . . . . . .