Jiang Yue, who was about to graduate from college, was in a very confused period. His girlfriend of four years left him. After learning about Le Jiajia from a quarrel with his girlfriend, he decided to return to China. After leaving without saying goodbye four years ago, he always felt that he owed his friends a formal farewell. Everyone's youth has something special. Jiang Yue missed these old friends very much and wanted to see them and talk to them again. But when he came back, many things had changed. Li He died in a car accident four years ago, Le Jiajia became ill after that, and Xu Zhenyu was forcibly sent to a mental hospital by his parents for treatment because of his sexual orientation. Four years ago, his parents divorced because of their cheating, and now they are planning to remarry. If Li He's death is a seed, how will it take root and sprout? What has happened to Le Jiajia, who liked him back then? This is a battle of growth, either joyful or sad. Who are we? Where does it come from? Where to go? This is a problem.