一张考卷之后我们就散了
[yī zhāng kăo juăn zhī hòu wŏ men jiù sàn le]
This nickname translates to 'After One Test Paper, We Part Ways'. This likely refers to an experience many go through, like after taking an exam in high school or university where friends then graduate and part ways. It expresses feelings of loss and nostalgia when a familiar phase of life comes to an end, especially due to some inevitable event.