Kodak (Ou Hao) received a package from 20 years ago. It evoked his infinite memories, and made him embark on the road back to his hometown. Following the route of memory, Kodak went all the way back to his alma mater in high school. The dusty past, the years buried in the heart, the angelic girl Xia Ye (Zhang Huiwen)... those memories of youth and first love came to mind. At that time, they went to school together, went on adventures together, and agreed to go to the center of the world together. The pure love made them feel happy. However, the cruel reality cannot be avoided... But the two hearts that know and love each other are more determined. This journey of memories allowed Kodak, who was wandering in the maze of the past, to open his long-closed heart. He saw the past again and discovered the future. Kodak remembered his agreement with Xia Ye and continued to look for the center of the world that Xia Ye missed most during his lifetime.