After knowing the location of the Department of Ancient Books, it is on the southeast side of the first floor of the Peking University Library. Liu Zhilu came across some good books about ancient book restoration and other specialties in the bookstore, and he would buy them; And write Yang Nannan's name on the plastic wrapping film of the book cover, which is covered by a smooth plastic film, so there will be no pen and ink left on the book cover, but there will be traces of pen writing.

Even if the plastic film is unsealed, the pen marks of Yang Nannan's name will still be visible on the book cover from an oblique angle.

After dealing with this way, I passed by the Department of Ancient Books after work in the evening; Taking advantage of the fact that there was no one around, Liu Zhilu put the purchased books in the anti-theft net at the window of the Department of Ancient Books. The next day, someone opened the window and found the book, and when they saw the pen marks of Yang Nannan's name on the book cover, they would hand the book into her hands.

Before receiving the "Sixteen Views of Southern Painting", Yang Nannan had received the "Restoration and Binding of Ancient Books" sent by Liu Zhilu in the above way. She guessed that it was sent by Liu Zhilu, but there was no conclusive evidence, there was no way to retreat, and she needed it, so she had to accept it!

Except for breaking into the Department of Ancient Books and meeting Yang Nannan twice, Liu Zhilu almost never met Yang Nannan on campus. He thought it was amazing and couldn't help but ask: How did she hide?

But from an objective point of view, there really is nothing magical about it. The reason for this is that there is almost no overlap in their range of activities.

Yang Nannan's daily life, work, classes and study activities are the library in the middle of the school and the law school in the northeast, and the canteen where she eats is mainly Yannan Garden, which is in the middle of the school, and the farm that is relatively close to the east of the school.

Liu Zhilu's place of work is to the west of the school, and the only way to eat is to the art garden, which is located to the west of the school. After work, his main activities are Weiming Lake in the north of the school, Minghe Garden in the northwest corner, Zhongguancun Book Building and the National Library outside the school.

The place where Yang Nannan often stays is the library of Peking University, where Liu Zhilu is inconvenient to enter, and Liu Zhilu almost never goes to the law school. The Zhongguancun Book Building and the National Library, which Liu Zhilu often visits, Yang Nannan does not need to go at all or has no time to go.

Once, Yang Nannan may have missed the food in the art garden. It was a cold day, and she wore a coat, hat and mask into the art garden cafeteria. She ordered a roasted hairtail slice, roasted beef with carrots, stir-fried cabbage and rice. After packing the bag, she was carrying it out the door.

Liu Zhilu happened to have just finished eating, so he followed her and walked out. As he walked, Liu Zhilu felt that the plump and backward ass of the girl in front of him attracted his attention, and it looked very familiar. After a while, Liu Zhilu began to think: Is this person Nan Nan?

Yang Nannan's ass seemed to have eyes, and she felt that Liu Zhilu was staring at it, and she was shy and anxious to dodge. In this way, Liu Zhilu is more sure that she is Yang Nannan.

Yang Nannan didn't expect that she was dressed like this, but she was still recognized by Liu Zhilu. She's really sloppy, she should wear a long coat to completely block her ass. She thought that Liu Zhilu was deliberately trying to follow her, so she quickly got into the door of the stairs next to the Yiyuan restaurant. Her face immediately turned out of the door, her eyes closely following Liu Zhilu's movements.

Coincidentally, Liu Zhilu's bicycle happened to be parked next to this door. When Liu Zhilu lowered his head and locked the car, Yang Nannan's position just happened to see him clearly.

After unlocking the car, Liu Zhilu reluctantly pushed the bicycle and glanced at the door, then got in the car and drove away. But it didn't take long for Liu Zhilu to ride back again. He took a deep look at her, and then sped away in the way she could see all along.

Liu Zhilu's move was obviously to tell Yang Nannan that he had gone far away, and she could leave with peace of mind, without worrying about being followed by him!