C148 Children Assisting

"Professor Sun, what are you doing here?" Li Yun suddenly appeared behind Sun Chang and shocked him. "You are..."

She looked at the saliva on the ground with a strange expression.

Sun Chang immediately said, "I don't know which student spat on the ground. Look, I was just about to catch this student and teach him a good lesson!"

"Oh, so it's like that..." Li Yun smiled