Xu Xiamo, a girl who is about to turn 16, searches for the memories and promises she lost in a car accident ten years ago.
Alone, I came to the playground of my childhood.
Solving the mystery that belongs only to her.
As the mysteries are solved one by one, she is facing the destined outcome step by step.
The gears of fate turn again ten years later...
"This time, can I remember you?"
"How about I keep my promise with you?"
In the midsummer of 16 years old, at the end of this summer, can the girl meet her fateful ending...