Unable to Distinguish between Right and Wrong

As soon as he heard Li Sinuo try to say that Yun Xi had been involved in the theft, Teacher Xu couldn't help but jump to her defense.

"Yun Xi has been discussing academic topics with me in the office right up until the principal called me, so when had she been able to come up here?"

"Teacher Xu, I know you have always been biased toward Yun Xi, but I'm telling the truth. She really locked me in here. I also am completely surprised that she would come in here to steal things..."

The homeroom teacher promptly refuted Li Sinuo's slander. "I do not believe for one second that Yun Xi would do such a thing. She was in my office just now, and other teachers have also seen her there."

The principal understood the situation with Yun Xi. In the final year of high school, the teachers and indeed the school itself were judged according to their school's college entrance exam passing rate.