Who Is She?

Nuannuan did not care about what others thought of her. She walked to the back of the classroom, picked up her bag, and left.

The invigilator picked up Nangong Nuannuan's paper and casually glanced at it before his eyes froze.

His glance just so happened to land on her neatly-written composition.

He happened to be a Chinese teacher, so he took a few more glances. He was really shocked by what he was seeing. 

20 minutes. Even if she had known the answers in advance, and even if she had memorized them, she should not have been able to finish all the questions in that time!

However, this female student named Nangong Nuannuan had not only finished all the questions, but her answers were all correct. Even the composition... was written perfectly.

How... Did she do it?