26-Year-old Xu Zhiyi is a white-collar young man working in the United States and preparing to return to China. One night when she was about to return home, she was playing with her phone as usual and getting ready to fall asleep. But when she opened her eyes again, she returned to ten years ago and became herself ten years ago.
Facing the familiar yet unfamiliar high school life; those who were once close but later drifted away; those who only had a slight sense of existence in her memory; those who she always wanted to know but did not have the courage to meet... How should 16-year-old Xu Zhiyi use the thoughts of 26-year-old Xu Zhiyi to grasp what she lost and savor everything she missed?