A boy named Song Yu met a boy named He Chu in his dull and bitter high school life. Because of He Chu's persistence, Song Yu agreed to him and became friends. At the high school graduation party, He Chu was drunk and kept talking. Song Yu took him into the car and remembered his childhood friend on the road, but he got into a car accident. Due to some strange combination of circumstances, Song Yu traveled to his childhood, and He Chu traveled to 20 years later.
Intent: On the separation and development of the past and the future