那些年教室里传情的小纸
[nèi xiē nián jiào shì lĭ chuán qíng de xiăo zhĭ]
The term 'those years' suggests nostalgia, and the 'love notes passed in the classroom' evoke a romantic, bittersweet memory of student days filled with shy love notes shared between crushes. This nickname implies looking back fondly at young love during school times.