The concubine is a man, and the illegitimate son of a divine physician has a spatial ability.

Yin Zijing, with her bound feet, wore a light pink undergarment made of the finest fabric, soft and light, which further accentuated her delicate beauty, like a flower reflected in water or a willow swaying in the breeze. The garments fluttered with her steps, making her appear as light and graceful as a petal, delicate and slender.

Yin Zijing walked to the entrance of the modern laboratory, pressed the silver button next to the door, and the silver door slowly opened to the left and right. Yin Zijing went inside, put on a white lab coat, washed her hands, and cut off the rather long nails of her ring and little fingers.

Whenever Yin Zijing felt she needed to practice medicine, especially when performing surgical stitches, she would cut off her long fingernails early on.

Therefore, one could often hear Granny Zhou nagging beside her: "Sixth Miss, please don't cut them anymore. You've never let your nails grow long. What will you do when you go back to the Yin residence? All the women there have long nails, and you'll be pointed at and gossiped about..."

Every time she said that, Yin Zijing would retort to Granny Zhou. Yin Zijing quickly said, "Granny Zhou, as you know, I study medicine, so my nails can't be too long. Besides, I always wear nail guards, so how could they know how long my nails are?"

Alright, Granny. Don't overthink it and worry unnecessarily. If Mother doesn't agree, I will speak to her myself. Granny has taken care of Zijing for many years; just consider it an act of kindness towards Zijing..."

Whenever Yin Zijing thought of these things, she couldn't help but shake her head. Inside the laboratory, the machine was constantly running, emitting a beeping sound. Yin Zijing walked to the silver platform in front of the laboratory, where many simple sanitary napkins that had been made were laid out in front of her, but their absorbency was not very good, and water would leak everywhere each time.

This time, however, Yin Zijing gritted her teeth and used her points to exchange for a lot of 100% medical-grade pure cotton gauze. She started conducting experiments again. Yin Zijing laid the cut medical gauze on the silver platform, adding several layers, and then a thick layer of cotton.

Then it was placed under a machine and pressed down hard. Then the image was placed on top, and it was placed under the machine and pressed down again. This process was repeated many times. Finally, several layers of medical gauze were placed on top. Then it was placed back under the machine.

And so, the simple sanitary napkin was compressed into a thin layer. Yin Zijing slowly poured the water from the glass onto it. The absorbency of the sanitary napkin improved significantly. Yin Zijing repeated this experiment many times…

Two hours later, Yin Zijing left the laboratory. She rubbed her forehead wearily, sat on the sofa, poured herself a glass of hot juice, and began to drink.

Knowing she wasn't feeling well, and unsure if it was due to the cooling medicine, Yin Zijing avoided all cold or icy foods to make herself feel better. She even drank hot juice, leaving the refrigerator in the lounge completely unused.

After finishing her juice, Yin Zijing lay down on the soft bed in the lounge and picked up her phone from the bedside table to search on Baidu...

Strangely enough, anything in this space that can be redeemed with points can be transported to the Great Sheng Dynasty. Over the past eight years, Yin Zijin has redeemed many things as well.

This item exchange center is connected to the modern world! Here, you can find everything the modern world has: cell phones, TVs, sofas, refrigerators, air conditioners, all kinds of clothes... even electricity, cell phone signals, and Wi-Fi are all available! Even more surprisingly, sanitary napkins, commonly used by modern women, are also available, but there is one requirement: you need to redeem them with points.

However, in the Great Sheng Dynasty, where etiquette was strictly enforced and feudal ideology reached its peak, he knew he couldn't easily display these items. Otherwise, it would surely cause a huge uproar and bring him unnecessary trouble. Therefore, he decided to first study them on his own and try to make simplified versions before gradually promoting them. Only in this way, by allowing the people of the Great Sheng Dynasty to gradually adapt to and accept new things, could he avoid causing too much of a stir.

Fortunately, he could use a mobile phone. With it, he could access information and search for relevant video tutorials anytime, anywhere, which undoubtedly provided tremendous help to his research. Thanks to the advantages of modern technology, he was confident that he would be able to successfully complete this arduous task.

In order not to be seen as a monster, Yin Zijin had to spend a lot of time and energy trying to make sanitary napkins that met the productivity level of the Great Sheng Dynasty.

If it weren't for that, when he himself had his period and faced many inconveniences, he would have long since thrown away that inconvenient menstrual pad and taken out the modern sanitary napkins from his storage space to use.

Yin Zijing envisioned developing not only sanitary napkins, but also all sorts of modern inventions: penicillin, electricity, various industrial machines, bicycles…

The Great Sheng Dynasty, which followed the Ming Dynasty, had always puzzled Yin Zijing. Historically, the Ming Dynasty should have been followed by the Qing Dynasty, but instead, the Great Sheng Dynasty, a completely different dynasty, had emerged. This situation made him wonder: was it a result of a time warp, or was it a parallel universe?

According to the Gregorian calendar, it is currently around the 17th century. Meanwhile, in the same era, Western countries are undergoing a massive transformation. They have entered the Industrial Revolution, ushered in the Steam Age, with machines gradually replacing manual labor, and even electricity is on the verge of being developed. Furthermore, significant progress has been made in weapons development.

In contrast, the Great Sheng Dynasty remained a feudal society, lagging behind in development. If this trend continued, in another hundred years, the Great Sheng Dynasty would likely face invasion and oppression. Powerful ships and cannons would force open the country's doors, leaving the people impoverished and the land barren. Thinking of this nearly century-long history of humiliation, Yin Zijin couldn't help but feel fear and worry.

However, Yin Zijing didn't know if this world was connected to his original world, or if they were two completely different worlds. Now that he was here, he felt he had to take action…

Lost in thought, Yin Zijing inexplicably opened WeChat. Looking at her parents' profile pictures, tears welled up in her eyes. She took a purple embroidered handkerchief, covered her face, and began to sob softly.

Yin Zijing tried to send WeChat messages to her parents, but she couldn't get through. Rou Rou explained, "The system blocked everything related to his parents to prevent Yin Zijing from being hurt..."