There is always a beginning for any bad thing. The sky was as dirty as sheets that haven't been washed for a long time. It was greasy and covered with drool. It made people sick. Without any warning, I could think of my short-sightedness in primary school when I couldn't see the blackboard. I was asked questions by the teacher and couldn't answer them. I stood in front of the class with a pencil in my hand and listened to other people's loud voices answering questions that I couldn't answer. Although it's not impossible, I still don't have the courage to say that I can't see the blackboard. As a result, I always face greater embarrassment and helplessness. After so many years, I can still remember it clearly. Walking on the street among the crowds of people, embarrassment suddenly hit me, just like before, and my head was dizzy and hot, just like when I was a child.