Introduction:
"What would you do if one day you met another you in the world?"
Ever since I was sensible, my mother would always ask me the same question every year on my birthday. Is there really another me in the world? Why do you always have that sad expression, Mom?
"Mom, where are you going? Wait for Xiaoxue. Xiaoxue can't keep up. Mom!"
"Xiaoxue, don't chase after her. It's an agreement. One day you will understand. One day you will meet her——!"
"Who is it? Who did you meet? Mom~~~~~You haven't told me yet, Mom~~~~~~~~Come back, Mom~~~~~~~~"