It rained in Beixin for two days.
It took Cai Niao two years to pry open Qiao Boxun's heart. He broke into the yard and saw the locked boy. He didn't know why he was locked up, he didn't know what was wrong with him.
He just knows. He didn't want to leave.
The days after that are too long and no one knows what will happen.
Purpose: Throughout one's life, one has to struggle hard in oneself, family and society in order to find relief.