Large classroom.

Quantum mechanics class.

More than one hundred students.

Zhang Zhai stood on the podium.

He coughed dryly, and then...

"Ahem, hello, classmates. Professor Liu has something to do today, so I will temporarily take over the class for him. My surname is Zhang. As for what my name is, you don't have to worry about it. I won't see you again after this class."

Zhang Zhai came up with a relatively humorous opening.

The quality of Peking University students is pretty good, and there is no such thing as Zhang Zhai making noise in class just because he is young.

Originally, Zhang Zhai could have gone through this smoothly. After struggling with this inexplicable lesson, he could still repay Lao Liu's favor.

but,

"Zhai Shen! I am your crazy fan! Can you sign your name for me?"
Chapter completed!