"Are you students?" A young girl in work uniform, about 20 years old, wearing a ponytail, looks very pure, with a sweet smile asked.

"yes." Yuyan also replied with a smile on her face.

"do you have your student ID card?"

"yes." Then the three took it out of their pockets. The girl looked at it one by one and said kindly, "well, please come in, take this little wooden card, and remember to change the student card when you leave."

the three men took the wooden card and went in. Yu Yan asked, "Wan Yang, where are you going and what book are you looking for?"

"go to the...