Zhang Xin, who is about to turn 30, saw a group of children on the street and couldn't help but recall her youth. There were a group of people in her youth that she could not forget. Zhang Xin was her happiest time when she got along with her friends, but they also gradually changed Zhang Xin, and Zhang Xin also changed from one person to another. When a girl who is familiar with the world grows up, she is like many people's youth. Some people and some things change her views on life, love, and friendship. It is not until her youth fades away that she sees youth clearly. No one knows what will happen tomorrow, so maybe tomorrow.