There is a room on the east and west sides of the main hall, and the doors are facing the hall, but the doors are closed.

She walked first to the door of the east room, which was closed but unlocked, and opened with a gentle push of her hand.

In the room, there is a carved wooden bed, a dresser of the same style as the bed, and in the middle of the room, a large incense burner is constantly emitting the fragrance of sandalwood, presumably this is Yin Ruoyu's boudoir.

Sandalwood, this seems to be Yin Ruoyu's favorite incense, or is it because the sandalwood fragrance is so strong that it can hide the residual smell after the medicinal bath?

The jewel that had turned into a human form, her five senses were more sensitive than ordinary people, and she had already smelled the smell of the medicinal bath in the sandalwood fragrance.

Walked around the room and found nothing out of the ordinary. She exited the room, closed the door and restored it to its original state, and walked to the door of the opposite room.

But he saw a brass lock locked in the closed door.

Ben just wanted to wander around casually, and didn't pay much attention to it, but seeing the door of this room locked tightly at the moment piqued her curiosity.

"Isn't it supposed that a girl's boudoir should be locked and hidden? Why is her boudoir not locked, but this room is locked?"

She thought in her heart, realizing that the locked room would have secrets that Yin Ruoyu didn't want to be known to outsiders, and even the girls who didn't want to be served to her, she came to the heart.

The small copper lock can't stop her from having a curious heart!

She stared at the copper lock quietly, her mind urged, and after a while, the copper lock "clicked", and the lock cylinder popped open.

Quickly opened the door and walked in, closed the door from the inside casually, and then turned back to look at the room.

It turned out to be a study......

At the window of the room, there are desks and chairs, and the four treasures of the study are all available.

As she approached the table, she was surprised to find a thin layer of dust on it, a stark contrast to the spotless boudoir just now.

Thinking about it, I figured out that the boudoir was not locked, and it was obvious that there was a girl who cleaned and burned incense regularly every day. And this study is locked, and no one can enter it at will except Yin Ruoyu himself.

There was a thin ash on the table, which only meant that the only owner who could enter the room had not entered the study for at least two days.

When I looked up, I saw that an entire wall opposite the desk had been made into a huge bookshelf, on which were full of books.

"Wow! In modern times, Yin Ruoyu is definitely a ...... at the level of a scholar" She couldn't help but sigh again, this whole wall of books, if a person does not eat or sleep, it is estimated that it will take three or five years to read them all, not to mention that judging from the newness of those books, most of the books are obviously often turned over and viewed.

She stepped forward and looked carefully, and found a whole wall of books, except for a few miscellaneous books, there were also twelve exercises and secret books of the Marfa Continent, and the rest were books on medical science and pharmacology.

It seems that Yin Ruoyu's study of medical science and pharmacology has far exceeded the study of other knowledge.

While sighing and looking at the whole wall of books, she always felt that something was wrong.

Taking three or five steps back and looking at the wall again, she finally saw what the problem was.

Most of the books on the shelves were a little worn out and yellowed because of age or human turning. Only the middle row of the shelves was at the margin, where a few thick books were not yellowed like the others, as if few people had turned them.

This subtle difference made her feel strange, and she couldn't help but walk up to the books and look at them carefully.

From the outside, those books are as big and thick as the 32-page Modern Chinese Dictionary in real society. Looking at the titles of those books from the side of the vertical hard-shell books, they are all books about medical science, which are the books that Yin Ruoyu often uses, why do they feel so new at a glance? Could it be that these books have just been added?

Thinking so, she reached out to take one of the books and look at it, but she didn't even touch the book, and the book seemed to be glued to the shelf?

She shifted her target and moved her hand to the next one, which did the same, and the book didn't move, as if it were nailed to a shelf.

This discovery made her a little excited, and there was something strange! And something strange meant that there was a secret......

She poked her head closer to the bookshelf where the books were located, and after careful study, she realized that there were slight gaps between the sides of the bookshelf and the surrounding bookshelves, not a whole.

And those seemingly thick medical books were indeed nailed to the bookshelf, forming an independent whole with this small bookshelf.

The experience of too many ancient spy war dramas told her that there is a mystery behind this small piece of bookshelf!

It's just that how to open this mystery?

She tried to pull at the thick books that were held in place, but there was no response. After taking a few steps back and looking at the whole wall, I didn't see anything special about opening the mystery.

The layout of Yin Ruoyu's study is very simple, except for the books on the wall, which is the desk and chair opposite it.

She retreated to her desk, intending to sit in her chair, but gave up on the idea of sitting down when she saw the thin layer of ash. In the end, she stood between the desk and the chair, and thought quietly: If she was Yin Ruoyu, where would it be more convenient to open the mystery?

After a moment's thought, she looked down at her desk.

In addition to the four treasures of the study, there are also one or two pharmacology books on the table, which Yin Ruoyu has obviously looked at recently, and has not had time to put them back on the shelves. Other than that, there's nothing special.

She bent down to inspect the four table legs, and found nothing unusual, but the moment she looked up to stand up, she found a protruding button-like thing under the table on the right hand.

She was overjoyed: this should be it!

Sure enough, when she pressed the protruding button with her fingers, there was a change on the opposite shelf.

I saw that the small piece of bookshelf, carrying the thick "books" together, first moved outward a few inches, and then slowly opened outward like a small door, until it opened at a right angle, and then gradually stopped moving.

She saw a square lattice appear behind the open wall.

Releasing the button, she eagerly walked to the bookshelf, only to see that in the dark compartment about thirty centimeters square, there was an ancient book with no title, and the paper was so yellow and worn that it seemed that if she picked it up and looked at it again, it would be broken......

The ancient book was so worn, as if it had gone through thousands of years.

Although she was worried that the ancient book would be completely damaged when she got it, she couldn't suppress her curiosity and reached out to gently pick up the book.

Turning to the title page, there is still no title, it is directly the content, and the content is written very randomly, not so much that this is a book, but that this is originally a manuscript written by someone, and then it was collected and bound into a book.

At first glance, the font is super charming, and it seems to be a little familiar.

She flipped through the book quickly but carefully, flipping through it, and couldn't help but be shocked......