Baek Jiyoung walked into Lee's Kitchen at 14:00 carrying a black equipment case the size of a briefcase and a laptop that looked like it had survived at least one dungeon deployment. She was maybe fifty, with close-cropped gray hair and the posture of someone who spent more time in construction zones than offices. Her hands were calloused in a pattern Dohyun recognized from the first life — mana-engineering calluses, the specific wear from handling channeling equipment that ran at industrial output levels.
Kwon followed two steps behind. She'd changed from yesterday's suit to something operational. Jacket. Flat shoes. She expected to be moving.
Junho was already at the door. He'd been managing the restaurant's front-of-house since morning, which meant he'd been making sure no one who wasn't supposed to be here showed up, and that the people who were supposed to be here had coffee. Two roles. He was good at both.
"Conference room?" Baek said, surveying the restaurant's interior with the practiced scan of someone assessing structural load capacity.
"Kitchen table," Junho said.
"I've worked in worse." She set her case on the table and opened it. Inside, arranged with the precision of surgical instruments in a tray: three sensor modules, a portable mana-flow meter, and a thick stack of paper held together with a binder clip. The paper was hand-annotated. Dense. The margins covered with calculations in a handwriting that was small, even, and fast.
Taeyang looked at the paper stack and then at Baek. The mutual recognition of two people who worked in numbers and who had both spent time carrying their work in physical form because digital records could be accessed remotely and paper couldn't.
"You're the sensor analyst," Baek said to him.
"Yes."
"Good. I have questions about your damage map that the Director's summary didn't cover. When did the most recent damage event occur?"
"Twenty hours ago. Three cuts in the eastern arc secondary channels."
"Methodological consistency with the prior seventeen points?"
"Same harmonic class. Different operator. The integration signature is newer — days of modification versus sixteen months."
Baek absorbed that without blinking. New variable, running calculation, number adjusted. She pulled out the paper stack and spread three pages on the table. Diagrams. The ring circuit's secondary channel network drawn in cross-section, with each damage point marked in red and dated. Her own version of Taeyang's damage map, built from the Association's sensor data.
"We have thirty-one damage events in total record," she said. "Fourteen have partially self-healed. Seventeen remain open. Three of those seventeen are the new eastern arc cuts. Your analyst's map matches ours for the seventeen open points. The fourteen healed points — we can discuss discrepancies later. Right now the priority is the repair operation." She looked around the table. "I was told I'd receive the material specifications for the infrastructure. The channel composition, structural tolerances, resonance frequencies."
Minhee put the notebook on the table. The inscription translation. The architects' technical documentation, decoded from eight-hundred-year-old notation.
Baek opened the notebook and read the first page. Then the second. Her reading speed was fast and her eyes tracked the content without pausing for the parts that required context she didn't have. The historical framing, the references to the architects' first activation cycle, the language about collectors and barriers. She was reading for engineering data, skipping narrative.
On the fourth page, she stopped.
"This describes a closed mana circuit with cardinal keystones," she said. "The channel material is described as — " She looked at Minhee. "Self-repairing? The infrastructure has an autonomous regeneration function?"
"At low rates. The architects built the channels from mana-conductive geological substrate that draws ambient mana from the surrounding rock and uses it to maintain structural integrity. The regeneration is slow — millimeters per month at undamaged sections. At severed junctions, the regeneration stalls because the ambient draw is insufficient to bridge the gap."
"So the damage points are too wide for natural healing to close."
"Correct. The cutting technique used by the — " Minhee paused. Chose her words. "By the operators who created the damage was specifically calibrated to sever channels at widths that exceed the natural regeneration threshold. The cuts are precision-targeted to create gaps that the infrastructure can't bridge on its own."
"Designed to beat the self-repair." Baek's voice was flat. Professional. The voice of someone who had just learned that whoever was damaging this system understood its engineering well enough to exploit its built-in redundancy. "What's the gap width at the average damage point?"
"Twelve to eighteen centimeters of channel material removed per cut," Taeyang said. "The natural regeneration rate at current ambient mana density is approximately three millimeters per month at those gap widths."
"So natural repair for an eighteen-centimeter gap takes sixty months. Five years. Per damage point."
"At natural rates. Yes."
Baek did the math in her head. Dohyun watched her run it. The quick flicker of her eyes, the slight movement of her fingers against the table, the sub-vocalized counting that engineers did when the numbers were too large for mental arithmetic and too urgent for the laptop.
"Seventeen open points," she said. "Average gap width fifteen centimeters. Natural repair rate three millimeters per month." She looked at Kwon. "Without augmentation, full natural repair takes fifty months. Four years and two months."
"We don't have fifty months," Kwon said.
"How long do we have?"
The table was quiet. Kwon looked at Dohyun. The question that required disclosure — how much did Baek need to know to do her job, and how much could remain compartmentalized.
"Twenty months," Dohyun said.
Baek looked at him. Not at Kwon. At him. Reading whether the deadline came from someone who understood engineering or from a politician picking numbers.
"Based on what?"
"Based on the mana-saturation curve for the Seoul metropolitan area. The infrastructure's activation trigger is linked to ambient mana density reaching a specific threshold. At current saturation rates, that threshold is reached in approximately twenty months."
"And if the infrastructure isn't repaired by then?"
"Then the weapon built into the ring circuit doesn't fire when the collection event activates, and twelve million people inside the barrier perimeter have no countermeasure."
Baek put her hands flat on the table. The same gesture Kwon had made yesterday. A different person, a different context, the same physical expression. Absorbing operational parameters that changed the shape of the problem.
"What's the weapon?" she said.
Kwon opened her mouth. Dohyun spoke first.
"The keystones, when activated in sequence at the collection event trigger, route the collected mana through the ring circuit in a feedback loop that destroys the collection mechanism and seals the dimensional seam. The infrastructure is the delivery system. The collection event's own energy is the ammunition. The architects designed a trap that uses the enemy's weapon against them."
Baek was quiet for six seconds. Then she pulled her laptop from the case and opened it.
"Show me the channel material specifications again," she said to Minhee. "Page four. The mana-conductive substrate composition."
For the next forty minutes, Baek worked. Not talked — worked. She took the inscription's material data and ran it against the mana-battery specifications from the shelter program's engineering files. The portable mana-flow meter came out of the case. She compared the infrastructure's resonance frequencies against the battery's output frequencies. She asked Taeyang eleven questions about the damage sites' geological profiles. She asked Minhee four questions about the architects' notation for channel repair rates under augmented conditions.
His phone buzzed in his pocket during minute twenty-three. He checked it under the table.
His mother: *Did you eat today?*
Three words. The same question she'd asked every day since he was twelve. Before the Awakening, before the regression, before the conversation on the couch that had changed the distance between them from zero to three feet. The question that had survived everything else.
He texted back: *Yes. Lee's Kitchen.*
Her response came in eight seconds: *Good.*
He put the phone away.
---
"Here's the math," Baek said.
She turned the laptop to face the table. A spreadsheet. Rows for each damage site, columns for gap width, ambient mana density, natural repair rate, augmented repair rate, and projected closure time.
"The mana batteries from the shelter program output at a controlled rate. I can tune them to match the infrastructure's resonance frequency — the data in your inscription gives me enough to calibrate. But the channel material has an absorption ceiling. Push too much mana through the repair interface and the substrate destabilizes. The channel doesn't heal — it fractures. So the limiting factor isn't the battery's output capacity. It's the channel's intake rate."
"Bandwidth," Taeyang said.
"Bandwidth. Each damage site can accept augmented mana at approximately four times the natural rate before destabilization risk exceeds acceptable parameters. Four times three millimeters per month gives twelve millimeters per month per site."
"Fifteen-centimeter average gap at twelve millimeters per month," Dohyun said. "Twelve and a half months per site."
"If we're running one site at a time. But the battery units are modular — I can deploy simultaneously across multiple sites. The shelter program built twenty-three industrial-scale batteries. Seven are committed to active shelter maintenance. That leaves sixteen available for redeployment."
"Sixteen batteries for seventeen damage sites."
"One site will have to wait for a battery to free up from the first completed repair. The smallest gap is the north-central junction at nine centimeters. That closes first — seven and a half months. Its battery redeploys to the seventeenth site, which adds approximately two months to the total timeline." She pointed at the spreadsheet's bottom row. "Total estimated repair timeline with parallel deployment across all seventeen sites: fourteen months. Give or take three weeks depending on geological variance at the individual sites."
Fourteen months. Twenty months available.
Six months of margin.
"That margin is conditional," Baek said, because she was the kind of person who stated the conditions before anyone could mistake the number for a guarantee. "Fourteen months assumes no new damage. Every additional cut in the secondary network adds a damage point to the queue. The batteries are at capacity — seventeen sites running simultaneously leaves zero reserve for additional work. A new cut means either pulling a battery from an active repair to address the new site, which extends the timeline for the abandoned repair, or waiting for a repair to complete before addressing the new damage."
"How many new cuts before the timeline exceeds twenty months?" Dohyun said.
She'd already calculated it. The number was on the screen.
"Three. Three additional cuts at average gap width, distributed across the secondary network, push the repair timeline past twenty months. The margin evaporates." She looked at him. "One more cut and the margin drops to four months. Two cuts, two months. Three cuts and we're in overshoot territory — the repair isn't complete when the saturation threshold hits."
Three cuts.
Na Yeonhwa had made three cuts in the eastern arc in a single night.
Dohyun looked at Sera. She was already looking at him. The same calculation.
"Can the batteries accelerate beyond four times natural rate?" Junho asked. He'd been standing by the kitchen door, arms crossed, listening.
"With destabilization risk, yes. I can push to six or seven times natural rate. But if a channel fractures during accelerated repair, the damage is worse than the original cut — the substrate shatters along its crystalline grain rather than severing cleanly. A fractured channel can't be repaired at all. The site becomes permanently dead."
"So pushing harder risks making it worse."
"Every engineering problem has that property," Baek said. "The question is whether the risk profile changes when the alternative is missing the deadline entirely."
Kwon had been quiet through the technical discussion. Watching. Cataloguing the operational requirements, the resource allocation, the institutional exposure.
"The engineering division can begin redeployment in seventy-two hours," Kwon said. "The battery units need to be extracted from the shelter infrastructure, recalibrated to the new frequency specifications, and transported to the damage sites. The dungeon access logistics need to be arranged — booking slots, security clearance for the field teams, cover stories for the gate monitoring system."
"Your field teams," Dohyun said. "How many people?"
"Three per site for the battery installation and monitoring. Fifty-one personnel for seventeen sites."
"Fifty-one people who need to know they're entering dungeons to repair sub-structural infrastructure."
"They need to know they're entering dungeons to operate mana-battery equipment on geological features that the Association has identified as strategically important. That's the compartmentalization. They don't need to know why the features are important. They need to know how to install the equipment and monitor the output."
Baek looked at her. The look of an engineer who had been compartmentalized before and who understood both its value and its cost.
"I need to know," Baek said.
"You do now," Kwon said.
"The weapon. The collection event. The twelve million people. The timeline." Baek tapped the spreadsheet. "This is a fourteen-month engineering operation to repair a weapon that stops an extinction-level event. I need my team leads to understand the stakes. Not the mechanism — the stakes. If a battery fails at month six because someone didn't monitor a variance reading because they thought this was a routine geological project, the operational consequence is catastrophic. My people need to know that failure costs lives."
"How many team leads?"
"Five. I can run seventeen sites with five team leads rotating between them. Five people who know the stakes. The rest follow protocols."
Kwon considered it. Dohyun watched her do the math. The expansion of the information circle from twelve to seventeen, the risk assessment, the operational security calculation that she'd been running for three years.
"Acceptable," Kwon said. "Brief them personally. No documentation."
"I brief my people the way I brief my people," Baek said. The first edge in her voice since she'd arrived. Not hostile — the boundary of a professional who had been asked to commit her team and who was not going to negotiate the terms of that commitment. "Verbal. No documentation. That part I agree with. But the briefing includes the timeline, the consequence of failure, and enough context that they understand they're protecting something worth protecting. I don't send engineers into active dungeons on trust."
"Agreed," Dohyun said, before Kwon could recalculate.
The table settled. Baek closed her laptop. Pulled the paper diagrams back into the equipment case. The sensor modules went in last, nested in their foam slots.
"Three days," she said. "First battery deployment at the north-central junction. That's the smallest gap and the cleanest geological profile — easiest site for calibration and initial testing. We confirm the frequency match, verify the absorption rate in field conditions, and establish the monitoring baseline. If the first site performs within parameters, we scale to full deployment across all seventeen sites within two weeks."
"Two weeks to full deployment. Fourteen months to completion."
"Fourteen months if nobody cuts anything else." She looked at him. "That's your problem, not mine. My problem is the engineering. Your problem is making sure nobody adds to my workload."
She stood. Picked up the case.
"Director." She nodded to Kwon. "I'll have the redeployment plan on your desk by tomorrow morning. Battery extraction can begin Thursday."
She left the way she'd arrived. No handshakes, no pleasantries. She was running logistics in her head before she reached the door.
Kwon stood.
"Baek Jiyoung built the shelter program's mana arrays in eleven months," she said. "The original estimate was eighteen. She's the reason two million people are in protected shelters instead of one million." She looked at Dohyun. "She'll deliver."
"And the three cuts."
"That's your operational domain. I'll provide whatever Association resources you need to secure the damage sites. Gate access control, monitoring augmentation, dungeon booking restrictions. Whatever limits the opportunity for additional damage." She paused at the door. "The eastern arc. The new operator. What's the status?"
"Contained. For now."
Kwon nodded. Left.
The team sat in the quiet that followed the departure of people who had just committed institutional resources to an operation that couldn't be explained to anyone outside this room. Junho brought coffee. The afternoon version — stronger, less milk.
"Three cuts," Sera said. "That's the margin. Three cuts and the math breaks."
"Yeonhwa made three cuts in one night," Taeyang said. "The pursuer's next asset could do the same."
"So we prevent the next asset." Dohyun picked up his coffee. It was hot. Junho always got the temperature right. "The pursuer modifies people through their mana profiles during sleep. It targets people with infrastructure access and existing belief frameworks. It selects operators who are already in position."
"We can't monitor every hunter who's cleared a dungeon near the secondary channels," Minhee said.
"We don't need to monitor all of them. We need to monitor the ones with the right profile. Sensory specialists. Infrastructure-aware operators. People who've been near the channels long enough for the pursuer to see them through its existing assets." He set the cup down. "Taeyang. How many hunters fit that profile in the registry data?"
Taeyang opened his laptop. The calculations he'd already been running.
"With the current parameters? Eleven. Including Seokhwan and Yeonhwa."
Nine potential targets.
Twenty months. Fourteen of them spoken for by the repair operation. A margin of three cuts that could evaporate in a single night.
Dohyun looked at the damage map still spread on the table. Seventeen red dots. The ring circuit at thirty-nine percent and falling.
His phone buzzed again. His mother.
*Come home for dinner if you can. I made your father's jjigae recipe. The one you used to like.*
The one he used to like. Twenty-four years ago in a life that no longer existed, before the war, before the regression, before the morning everything changed. She was reaching for something from before. A bridge built from a recipe.
He texted back: *I'll be there by seven.*
Three days until the first battery deployment. Fourteen months of repair. Nine potential targets for the pursuer. Three cuts of margin.
The arithmetic was clear. The arithmetic was always clear.
It was everything else that wouldn't hold still.
