I am your student: XXX. Today, I write this critical letter to you with guilt and regret, to show you my profound understanding of the bad behavior of running in the corridor and my determination never to run in the corridor again.

Sorry, teacher! What I have committed is a serious matter of principle. I know, and the teacher was angry that I was running around in the corridor. I also know that it is the most basic responsibility and obligation of students to ensure that they don't run around in the corridor. But I didn't even do the most basic things. I thought calmly for a long time afterwards, and I gradually realized that I had to pay for my impulse. I was deeply shocked by the teacher's repeated teaching and serious expression, and also deeply realized the importance of this matter. Now, a big mistake has been made and I deeply regret it. Deep review!