Su Meier thought that she would be separated from Song Xier when she entered high school. But she overthought it, and Song Xier turned out to be in the same school and class as her.
Song Xier gave Su Meier a panda doll on her 18th birthday. Su Meier didn't understand why she gave her a panda doll at the time, until she later discovered that the initials of "panda" were "XM".
XM——Ximei
Motto: Childhood sweetheart's love is worth falling from heaven