Han-Ho was on the rooftop at six forty five AM.
Not because the route brought him there at six forty five.
Because he had adjusted the route to bring him there at six forty five.
He had been adjusting routes for ten years to address things that needed addressing. This was the same. Something needed monitoring. He monitored it.
The rooftop was empty.
He pressed his hand against the surface.
Read it.
The meditation mark from Friday was still there. Faint now. Energy dissipates over time. By tomorrow it would be undetectable by anything except Stain Removal which did not care how faint something was. Faint was still a mark. A mark still had information.
He made a note.
Rooftop. Tuesday six forty five AM. Mark still present. Dissipating normally. No new activity since Friday. Monitoring.
He stood up.
Looked at the horizon.
The city was doing its Tuesday morning things.
Commuters. School children. The pojangmacha on the corner. The GS25 already open. The specific Tuesday energy of a city that has accepted the week is not going to be shorter than it was last week.
He had the rest of the route to do.
He did the rest of the route.
He came back at nine fifty AM.
Not planned.
He had finished the northern section earlier than expected because the three flagged locations from last week were all clear. No escalation. Good news. He had filed the all-clear reports and had forty minutes before the next section.
The rooftop was on the way.
He went up.
Opened the door.
Stepped onto the rooftop.
Stopped.
Someone was there.
Not sitting.
Standing.
At the center of the rooftop exactly where the meditation mark was.
An old man.
He looked approximately sixty. Han-Ho knew from experience that approximately sixty meant nothing about actual age in certain contexts. But the specifics of how this man looked approximately sixty were notable.
Not the approximately sixty of someone who had aged well.
The approximately sixty of someone who had stopped aging at sixty and stayed there for a very long time.
The skin was right. The posture was wrong. Not wrong in a bad way. Wrong in the way of someone whose posture had been refined past the point where gravity was a relevant consideration. He stood the way mountains stood. Without effort. Without the subtle continuous work of balance that every normal human body performs constantly.
He was just there.
Plain grey robes.
White hair worn simply.
White beard.
Eyes that were the color of sky just before dawn.
He was looking at Han-Ho.
Han-Ho looked at him.
Looked at the meditation mark under his feet.
Looked at the man.
"You came back," said Han-Ho.
"Yes," said the old man.
His Korean was perfect.
Not accented. Not translated. Perfect in the way of someone who had learned it recently and had learned it completely because learning things completely was what they did.
Han-Ho made a note.
Rooftop. Tuesday nine fifty AM. Subject returned. Male. Elderly appearance. Actual age unknown. Korean language — perfect. Standing on meditation mark. Non-threatening. Assessing.
"You were here Friday," said Han-Ho.
"Yes," said the old man.
"Before six AM."
"Yes."
"You left a meditation mark."
The old man looked at him.
"You can sense it," said the old man.
"Through the surface yes," said Han-Ho. "Stain Removal reads energy through surfaces. The energy type does not matter."
The old man was quiet for a moment.
"What did you sense," he said.
"Highly refined internal energy," said Han-Ho. "Not mana-based. Different fundamental type. Refined over a very long time through consistent practice." He looked at the mark. "The quality of the refinement is extraordinary. I have been cleaning surfaces for ten years. I have never encountered energy refined to that degree."
The old man looked at him.
"How long have you been training," said the old man.
"Ten years," said Han-Ho.
"Your cleaning technique."
"Yes."
The old man was quiet for a moment.
"In my world," he said carefully. "What you just described. Sensing energy quality through surface contact. Reading the refinement level. Distinguishing energy types." He paused. "That requires at minimum the fifth realm of martial arts."
"What is the fifth realm," said Han-Ho.
The old man looked at him.
"Internal mastery," said the old man. "Complete control of one's internal energy. The ability to sense the energy of others and the surrounding environment."
"I don't have internal energy," said Han-Ho. "I have Stain Removal. It reads what it cleans."
"And what is Stain Removal."
"My skill," said Han-Ho. "I am a registered Mana-Janitor. Rank F. One skill. I clean things."
The old man looked at him for a very long time.
Not threateningly.
The way someone looks at something they have been trying to understand for a long time and are now seeing for the first time in person.
"You have been cleaning the blockage," said the old man.
Han-Ho stopped writing.
Looked up.
"You know about the blockage," said Han-Ho.
"I have been trying to clear it for eight thousand years," said the old man. "From my side. Through the Dragon Veins. I could feel it but I could not reach it." He looked at Han-Ho. "You are clearing it from your side."
Han-Ho made a note.
Filed a report simultaneously.
Rooftop contact confirmed. Male. Elderly. From martial world. Aware of fracture network blockage. Has been attempting to clear it for eight thousand years from their side. Confirms Dragon Vein connection between worlds. Filing urgent. Notifying Director.
He sent it.
Looked at the old man.
"What is your name," said Han-Ho.
The old man considered this.
In ten thousand years nobody had asked him his name simply. Directly. Without the weight of his title or his reputation or the specific careful tone people used when addressing the peak of the martial world.
Just: what is your name.
"I am called the Unmoving Mountain," he said.
"That is a title," said Han-Ho.
The old man looked at him.
"Yes," said the old man.
"What is your name."
A very long pause.
"I don't remember," said the old man quietly. "It has been a very long time."
Han-Ho looked at him.
Made a note.
"Okay," said Han-Ho. "I will call you the old man if that is acceptable."
The Unmoving Mountain — the peak of the martial world, the only living person at the Life and Death realm, the being that had not been moved by anything in ten thousand years of existence — looked at Han-Ho.
"That is acceptable," he said.
"Good," said Han-Ho. "I need to ask you some questions about the Dragon Vein network on your side. The scan data I have suggests the blockage extends further than the Earth network. If you have been mapping it from your side for eight thousand years your data would help me understand the full scope of the cleanup."
The old man looked at him.
"You want my eight thousand year mapping data," said the old man.
"If you have it in a format I can use yes," said Han-Ho. "I have scan results from the Registry equipment team. Comparative analysis would improve the cleanup efficiency."
The old man was quiet.
In eight thousand years of attempting to clear the blockage nobody had asked him for his data in the context of comparative analysis for cleanup efficiency.
"I have it," said the old man.
"Good," said Han-Ho. "Can you come to a meeting? The Director of the Hunter Registry and the senior analyst Ms. Yoon would need to be present. Wednesday afternoon if possible. After two PM."
"I will come," said the old man.
"No shoes required," said Han-Ho. "But the Registry has a marble lobby floor that was recently cleaned. Please don't step on the left side near the decorative plant."
The old man looked at him.
"The residue returns there," said Han-Ho. "Near the east wall. The cleaning crew keeps missing it. I have filed a report."
"I will avoid the left side," said the old man.
"Thank you," said Han-Ho.
He put his notebook away.
Started for the door.
"Han-Ho," said the old man.
Han-Ho stopped.
Turned around.
The old man was looking at him with the sky-before-dawn eyes.
"How did you know my name," said the old man. "I had not told you."
Han-Ho looked at him.
"You are the peak of your world," said Han-Ho. "You have been trying to clear a twenty thousand year old blockage for eight thousand years. You came through a space that is not quite a Gate to find the source of what you felt in the Dragon Veins." He looked at the meditation mark. "You meditate with enough precision and refinement that your energy mark is still readable four days later." He paused. "Ms. Yoon's file on dimensional arrivals has a preliminary section on the martial world. The description matched."
The old man looked at him.
"Ms. Yoon has a file on my world," said the old man.
"Ms. Yoon has a file on everything," said Han-Ho.
He went through the door.
Moru had been on his shoulder the entire time.
Had said nothing.
Han-Ho went down the stairs.
Out of the building.
Onto the street.
"Moru," said Han-Ho.
"Yes," said Moru.
"The old man."
"Yes."
"His energy."
"Yes Master."
"Is it clean."
Moru was quiet for a moment.
"It is the cleanest human energy I have ever encountered," said Moru. "In ten thousand years across nine dimensions. Including yours." A pause. "His is cleaner."
Han-Ho walked.
"But yours," said Moru carefully. "Is different from clean."
"Different how."
"His is clean the way something refined over ten thousand years is clean," said Moru. "Achieved. Worked toward. Built." He paused. "Yours is clean the way something has always been clean is clean. Not achieved. Just—" He stopped. "Just what you are."
Han-Ho walked.
Made a note.
Old man energy assessment: cleanest human energy Moru has encountered in ten thousand years. Comparative note: mine is different category of clean. Will not overthink this. Has no bearing on the route.
He closed the notebook.
"Moru," said Han-Ho.
"Yes."
"Wednesday meeting. I need you to help translate if the old man's sounds are different from what I can understand."
"His language is not sounds," said Moru. "He speaks Korean."
"I mean the energy translation," said Han-Ho. "If he describes things in martial world terms I will need help converting them to Registry terminology for Ms. Yoon's file."
"I can do that," said Moru.
"Good."
They walked to the GS25.
On the rooftop the old man stood where Han-Ho had left him.
Looking at the door.
In ten thousand years of existence he had developed the ability to assess people completely within minutes of meeting them. Their cultivation level. Their intent. Their fundamental nature. He had been wrong about people perhaps three times in ten thousand years.
He had just met Han-Ho.
He could not assess him.
Not in the conventional sense.
The cultivation level was unreadable.
The intent was clear: clean things. Simple. Real. Complete.
The fundamental nature was—
He looked at the door Han-Ho had gone through.
The meditation mark under his feet was clean now.
He had not noticed until now.
At some point during the conversation Han-Ho had cleaned it.
Without mentioning it.
Without making it a thing.
Just cleaned it the way he cleaned everything.
Because it was there and needed cleaning.
The old man looked at the clean spot where the mark had been.
Looked at the door.
In ten thousand years of existence he had met three people who had genuinely surprised him.
This was the fourth.
He stepped off the rooftop into the space between worlds.
Went back through.
Found his disciple waiting.
"Master," said the disciple. "You were gone for—"
"Pack what we need," said the old man.
The disciple stared at him.
"We are going," said the old man.
"Through the Gate."
"Yes."
"To Earth."
"Yes."
"When."
"Wednesday," said the old man. "Before two PM." He started walking toward the sect. "And find out what honey butter chips are."
The disciple stared at his retreating back.
"Master," said the disciple.
"Yes."
"What are honey butter chips."
"I don't know," said the old man. "That is why I told you to find out."
The disciple stood on the rooftop.
Looked at the space between worlds.
Looked at the direction his master had gone.
Went to find out what honey butter chips were.