"I'm sure."
"Alright." The principal also wanted to find out the truth. The school had spent a lot of effort on their students. He did not wish for them to turn out to be such a disgrace.
The principal picked up the phone and dialed Teacher Liu's cell phone directly. The midterm exam was just over and Teacher Liu was on the night shift, disciplining the students. He came to the office with the documents as soon as he received the phone call.
In fact, after what happened at the school, some of the students had already reported the incident to Teacher Liu.