Perhaps every seemingly beautiful past has some hidden sadness. A few years later, Qin Qin passed by Zi'an Chinese and English Primary School again. Zi'an was still in the sunshine, looking ignorant of the world. She wondered if Xiaoqin was still lingering here at that time, and then she understood that everything was due to this.
This is just the reluctance of a primary school student named Qin Qin to look back. Maybe, we will all be her.