The medical report is the voice of the Medical Pavilion.
On a set day each month, it flies to the affiliated medical halls centered around the main medical institution, introducing the current state of medical affairs in the martial world and new treatment methods.
"There are three renowned Medical Pavilions in the martial world."
The White Lotus Pavilion run by the White Lotus Immortal.
The Flower Pavilion managed by the Flower Master.
Lastly, the Black Pavilion operated by the Blood Sage.
These were called the Three Great Medical Pavilions of the world, and their leaders were referred to as the Three Great Divine Healers.
Among them, the White Lotus Pavilion excelled in acupuncture, the Flower Pavilion was strong in herbal medicine, and the Black Pavilion was known for its rare talismanic arts, even in the martial world.
"Still, calling him Master doesn't quite roll off the tongue..."
The more I think about it, the more extraordinary the White Lotus Immortal seems.
He truly is an amazing person.
Master, Master Jegal Lin.
"It would be easier if I could just call him Teacher or Professor."
It's a challenge for someone from the modern world.
Master spoke.
"Come in."
I entered the room at Master's invitation.
"It's impressive, but somehow... it's quite empty."
In the middle of the room was a brazier.
The large window was wide open, and inside the brazier, white charcoal was burning.
The room was sparsely furnished, with no decorations or ceramics, making it seem excessively barren.
Yet, it was impressive, exuding the spirit of a scholar.
However, to Jincheonhui, who was from the modern world, various issues were apparent.
"Wow. This is just like something you'd see in a drama... but the more I look at it..."
Jincheonhui felt a pang of sympathy as he looked around the room.
It was an incredibly cold room.
Watching historical dramas set in the martial world, you realize that the scenes where people are indoors in winter, with visible breath and cold hands and feet, aren't just for show.
Living with the window open even in winter! It's truly shocking.
"I should get an ondol boiler for Master's house..."
Ondol.
A traditional Korean heating system with a long history.
"I didn't think of this when I talked to Master last time... It's a good thing. I should fix up the house a bit. With ondol, I can do something about that window..."
Jincheonhui glanced at the wide-open window.
"I understand it's open to prevent carbon monoxide poisoning, but doing that even in the dead of winter is a bit... It's far from enough. At least use a sealed bronze stove or something!"
Such things haven't been invented in this era.
Although Master is a genius in medicine, he is not a god.
He can save dying people, but he doesn't have the skill to bring inventions from the future.
Jincheonhui let out a big sigh.
"It's a long way to go... Ondol is a major construction project, so I can't use it right now. What's needed immediately is a stove. A stove, and to improve lighting, glass windows. For ventilation, a heat exchanger would be nice. But how do I make glass windows?"
Jincheonhui clicked his tongue.
"It doesn't seem like glass crafting technology is entirely absent, but I haven't seen a single house using glass windows on the way here."
While looking around, Jincheonhui checked what was needed, and Jegal Lin watched with a faint smile.
Sitting in front of the brazier, Jegal Lin spoke after a moment.
"You've been thinking for a long time. So, what were you thinking about?"
"Ah!"
Only then did Jincheonhui come to his senses and look ahead.
"I'm sorry, Master. I got lost in thought..."
"That can happen. So, as I asked earlier, would you tell me what you were thinking?"
"Should I say it... No, I should. Master is a patient."
"I was thinking about creating an environment conducive to treating your cold pulse condition, Master."
"Oh?"
Jegal Lin's eyes widened slightly with interest.
Jincheonhui approached and sat across from his Master, who placed a kettle on the brazier.
"The Cold Pulse Condition. A constitution where cold energy gathers in the body, blocking the meridians. Right?"
"That's correct."
"Although we talk about cold energy, in practical terms, it means the body's warmth disappears and coldness sets in. Simply put, if we can replenish the lacking warmth in the body, we can alleviate the complications caused by the Cold Pulse Condition."
"That's what you explained last time. I thought it was a unique perspective then too. So?"
"First, this room is the problem. If you live here, your symptoms will inevitably worsen, Master."
Jincheonhui stated firmly.
At this, Jegal Lin's smile faded, and he became serious.
"Then what do you think is the solution?"
"From here, it's not a matter of medicine but of construction. It's the domain of a builder, not a doctor. But both are necessary for a patient, aren't they?"
No one is as sensitive to their environment as a doctor.
Modern doctors wear white coats for this reason.
White shows dirt the quickest.
Moreover, hygiene is always a concern.
Secondary infections are one of the main causes of disease spread.
It's common sense in modern times, but not in this era.
From that perspective, improving the environment is also an area of concern for a doctor.
"First, this room is too cold. One brazier isn't enough."
"Then should we increase the number of braziers? But if we do, one might die suddenly. The cause hasn't been identified yet, but... I think the symptoms are somewhat similar to drowning."
"Drowning... It's similar. It's actually carbon monoxide poisoning."
"Oh?"
"We breathe, but it's actually oxygen that sustains our breath. However, when something burns like this, carbon monoxide is produced instead of oxygen. And if you inhale too much of it..."
"You end up like someone who drowned. Dying not from water but from breathing."
Despite lacking basic knowledge, he quickly deduced the situation.
Jincheonhui was amazed by his genius.
"Yes, that's right."
Jincheonhui nodded lightly.
But the White Lotus Immortal, Jegal Lin, looked at him with a serious expression.
"Where did you learn such knowledge? My family has pursued knowledge for many years, but I've never heard of what you mentioned."
"It's a secret."
"Even to your Master?"
"Yes. Even if I told you, you wouldn't believe it, and it's dangerous."
"In matters like this, I mustn't lie. The White Lotus Immortal in the novel, no, Master, isn't an ordinary person. A genius. And a sage. But not someone who would be easily fooled. Considering the text about avenging the Jegal family, he must have decisiveness and ruthlessness."
Master's eyes seemed to pierce through Jincheonhui.
But soon, he nodded.
"I understand that you're not an ordinary child. That's why I said it's okay if you don't answer anything. I've decided to accept everything about you. So... thank you for telling me such things for my sake."
Master said with a gentle smile.
"So, should we build a new house?"
With those trusting eyes, Jincheonhui felt a strange tightness in his chest.
"Why does this person trust me so much?"
Someone who can't even tell a single proper truth.
Why does he trust me like this? Is that what a Master is supposed to be?
Somehow, the face of the director from the orphanage in his childhood came to mind.
Suddenly, he felt like crying.
But he held back and spoke.
"First..."
Jincheonhui continued his explanation and received permission.
Jincheonhui asked to be introduced to a craftsman.
Jegal Lin said,
"For most things, Yooho should suffice."
Yooho was the chief manager of the Medical Pavilion.
His main job was assisting the White Lotus Immortal.
It seemed he handled such matters as well.
Jincheonhui carved a piece of cold charcoal into something like a pencil.
"Ah, having this is a bit better. I just can't get used to using a brush."
Jincheonhui's hands drew a fairly decent blueprint.
It was a Korean-style ondol.
Although it was in his mind, drawing it wasn't easy.
But it was okay.
It didn't have to be perfect.
What mattered was conveying the idea.
Watching various documentaries in the past seemed to help now.
Things like ondol construction and the history of stoves.
"While I'm at it, should I draw a few more things?"
Feeling inspired, Jincheonhui continued drawing until his fingernails turned black.
Then he quickly took it to Yooho.
"Can this really be made...?"
Yooho was confused.
It was a story from a child not yet even of age, but it wasn't absurd and was logically sound.
It seemed theoretically possible.
The story about building houses like this in the eastern regions seemed to be true.
"This is called ondol...?"
"Yes."
"And this is a stove."
What Yooho pointed to were the drawings Jincheonhui had made.
Among them, the stove was a sealed type that didn't let gas escape.
It was exactly like the stove used to warm lunchboxes in the old days before elementary schools were renamed, back when they were called national schools.
But that didn't mean it would be easy to make.
The key to the stove was its sealing function.
If gas leaked, it would be a disaster.
Jincheonhui thought for a moment.
"Ah. Do they use heaters in elementary schools these days?"
The name had changed to elementary school.
Now, even the memories were fading.
Still, he remembered studying the structure of stoves briefly in textbooks.
Back then, Jincheonhui couldn't afford to get study materials, so he memorized and memorized until his textbooks were black with notes.
"Is this... making walls with glass?"
"It's a window."
"A window..."
"You can receive sunlight without opening the window."
"Is sunlight that important?"
To explain easily, Jincheonhui racked his brain.
"Rice needs sunlight to grow, right? People also need a certain amount of sunlight to stay healthy. That's why it's necessary. Especially, it needs to be made very transparent. Can you do it?"
In this world, unlike modern Earth, there were no alternatives, so to keep producing vitamin D in the body, this was the only way.
Given the nature of the condition that continuously stressed the cardiovascular system, vitamin D production was very important.
Jincheonhui was actually considering writing down the process of making glass.
Among the many documentaries he had seen in the past, there was one about the history of glass.
At Jincheonhui's small provocation, Yooho chuckled.