The pre-approval form had seventeen fields.
Sera filled them out on the encrypted tablet at 0600 on day thirty-seven, sitting at her workbench with the stylus in her right hand and a cup of Shin's French press coffee cooling in her left. Experiment title. Objective. Materials required. Risk assessment. Expected outcome. Containment protocol. Personnel involved. Duration. Disposal plan. Nine more fields that felt like they'd been designed by someone who'd never conducted an experiment and wanted to make sure no one else could, either.
She submitted four requests. The first three were routine — crystal synthesis (approved by noon), healing accelerant refinement (approved by 1400), and mana toxicity testing on a new batch of dungeon beetle carapace (approved by 1530). Three approvals in nine hours. Twelve hours faster than the stated twenty-four-hour turnaround, which meant Hwang was prioritizing her requests. Or someone in Hwang's office was.
The fourth request was denied.
**Experiment: Direct interaction between Protocol-Restricted fluid (Mugyeong-origin) and human biological tissue (blood sample, self-donated)**
**Status: DENIED**
**Reason: Protocol-Restricted substances may not be applied to human biological material without Ethics Review Board approval (minimum 30-day review period) and written consent from the Ministry of National Defense Bioethics Committee.**
Thirty days. A month of review, paperwork, committee meetings, ethical hand-wringing by people who'd never been inside a dungeon and thought mana was something you read about in academic journals. By the time the review cleared, she'd have lost thirty days she couldn't afford to lose.
She stared at the denial notification on the tablet screen. The stylus felt dead in her hand — the same flat, disconnected feeling she'd had since switching from paper. [Brew] flickered at the edges of her perception, present but muted, like trying to hear someone speak through a closed door.
"Denied?" Shin asked from the monitoring station.
"Bioethics committee. Thirty-day review for human tissue experiments with restricted substances."
"Can you appeal?"
"I can submit an expedited review request, which goes to a different committee that meets biweekly and has a fifteen-day backlog."
Shin was quiet for a moment. "So minimum forty-five days."
"Minimum." Sera set the stylus down. Picked up the coffee. It was cold. She drank it anyway — cold coffee was still caffeine, and caffeine was the only unregulated substance in her life. "The hack requires direct interaction between the fluid and human biology. Specifically, my biology. The Ethics Review Board won't approve self-experimentation because it violates approximately nine different Geneva-adjacent protocols that Korea adopted after the Awakening."
"And going around the review?"
"Gets me court-martialed or worse, depending on how creative Hwang's legal team feels."
She thought about the gate. The open corridor. The pool of fluid, offered. The [Brew] cascade that had shown her the divine-class pathway through the System's barrier. The gate wanted her to brew the recipe. The System wanted to prevent it. The military wanted to control it. And the Ethics Review Board wanted thirty days to decide whether she was allowed to put a drop of fluid on a blood sample.
Bureaucracy was the most effective containment protocol of all.
---
But Sera hadn't spent three years as an apartment alchemist because she followed prescribed methodologies.
She couldn't test the fluid on human tissue. Fine. The Ethics Review Board's jurisdiction covered human biological material — blood, tissue, organs, genetic samples. It did not, as far as she could determine from reading the actual regulation text on the tablet for two hours, cover non-human biological material that had been modified to share characteristics with human biology.
The rat's blood was not human. It had once been a C-rank dungeon rat's blood, and it was now something else entirely — a hybrid medium containing both terrestrial and Mugyeong biochemistry. If the Mugyeong compounds in the rat's blood had stabilized, if the integration had reached equilibrium, then the rat's blood was a bridge. A midpoint between the raw fluid and human biology. Testing the fluid against the rat's blood wasn't a human tissue experiment. It was an animal-derived compound interaction study.
She submitted request five at 1100.
**Experiment: Interaction analysis between Protocol-Restricted fluid and blood samples drawn from Modified Organism #1 (dungeon rat, anomalous classification)**
It was approved in forty minutes. Hwang's office either didn't catch the implication or chose not to flag it.
"I need the rat's blood," Sera told Shin. "Ten milliliters. Full sterile draw."
Shin prepared the kit — syringe, collection tubes, alcohol swabs. She'd done this before, on day nine, when they'd first analyzed the rat's changing biochemistry. The rat had been cooperative then. Whether it would cooperate now, after two more weeks of transformation—
Shin opened the containment enclosure's outer shell. Biometric lock, her thumbprint. Inner cage, manual latch. The rat sat at the front, watching, its crystalline structures catching the overhead light and scattering it in directions that made Sera's eyes water if she looked too long.
Shin reached into the cage with the syringe.
The rat extended its left foreleg.
Not slowly. Not as a reflex or a coincidence. The rat looked at the syringe, looked at Shin, and held out its leg with the deliberate precision of a patient offering a vein to a phlebotomist. Its crystalline foreleg was almost entirely transformed — more crystal than fur, the lattice structures visible as a fine network under translucent skin.
Shin froze. The syringe hovered.
"It's cooperating," Shin said.
"It understands what you're doing."
"It understood last time too. This is different. Last time it held still. This time it's *helping*."
The distinction mattered. Sera watched from two meters away as Shin drew the blood — the syringe filling with fluid that was dark, darker than normal blood, with a faint iridescence visible in the collection tube. The rat held its leg steady throughout. When Shin withdrew the needle, the puncture sealed in under three seconds. Enhanced healing. A-rank regeneration from a single needle stick.
Shin closed the cage. Locked it. Stepped back.
The rat lowered its leg and resumed its surveillance of the lab. The blood draw had taken ninety seconds. The rat had participated as a willing subject, not a captive specimen.
"It wants us to succeed," Sera said.
Shin looked at her. "How do you know that?"
"Because it's connected to the gate. The gate wants me to brew the divine-class recipe. The rat is the gate's representative in this lab — its eyes, its ears, its... liaison. If the gate is invested in my work, the rat is invested in my work. It'll cooperate with anything that moves the research forward."
"And if the research moves in a direction the gate doesn't want?"
Sera didn't answer. She took the blood samples to her workbench.
---
Under the mass spectrometer, the rat's blood told a story of equilibrium.
The Mugyeong organic compounds that Kang had first identified on day nine were still present — the complex carbon chains, the non-terrestrial molecular structures, the biochemistry of an extradimensional organism integrated into a terrestrial host. But where the day-nine analysis had shown active integration — compounds replacing standard metabolic pathways, rewriting the host's biology in real time — the day-thirty-seven analysis showed stability.
The compounds had stopped spreading. The integration had reached a boundary and held. Approximately 40% of the rat's biochemistry was now Mugyeong-origin. The other 60% was terrestrial — modified, adapted, but recognizably rat. Two biologies occupying the same organism, neither one consuming the other.
A hybrid. Stable. Functional.
"The integration has a natural limit," Sera murmured, recording data on the tablet. The stylus moved across the screen, and [Brew] flickered in response — muted, distant, but responding to the data with faint probability readings that confirmed what the spectrometer showed. "The fluid doesn't convert the entire host. It integrates until it reaches equilibrium, then stops. 40% conversion. That's the saturation point."
The implications cascaded. If the rat was at 40% conversion and stable, then the fluid didn't turn organisms into gate creatures. It created something new — a hybrid state that preserved the host's original biology while adding Mugyeong capabilities. The crystalline structures, the enhanced strength, the insomnia, the intelligence — all products of the 40% that was Mugyeong. The remaining 60% was still rat.
And the rat was still alive. Still functional. Arguably thriving, if you set aside the insomnia and the inability to eat standard food.
"If I administered the fluid to myself," she said, testing the thought aloud, "the integration would stabilize at approximately 40%. I'd retain 60% of my original biology — including [Brew], which is tied to my System designation, not my physical body."
"The 40% Mugyeong integration would affect your System connection," Shin said from the monitoring station. She'd been listening. She always listened. "The rat's System classification changed from standard dungeon fauna to 'anomalous.' Your classification would change too."
"A classification change isn't a modification. The System reclassified the rat because its capabilities changed, not because it altered the rat's abilities. [Brew] would still be [Brew]. But the Mugyeong integration might — might — interact with the System's modification at the code level, the way the fluid interacts with System connections in general."
"Might."
"Might. Which is why I need to test the fluid against the rat's blood first. The rat's blood is the closest available analog to what my own blood would look like post-integration. If the fluid interacts with the stabilized Mugyeong compounds in a way that affects System code structures, I'll see it in the blood work before I see it in myself."
She prepared the experiment. Three milliliters of black fluid in a sealed reaction vessel. Three milliliters of the rat's blood in a separate vessel. The mass spectrometer configured for real-time analysis. [Brew] activated — distant, but present.
She combined the samples.
The reaction was immediate.
Not violent — not the explosive chain reactions of failed crystal synthesis or the toxic fog of mana toxicity suppressant gone wrong. This was quiet. The black fluid and the rat's blood merged in the reaction vessel with a smoothness that looked almost organic, two liquids combining without turbulence, without heat, without any visible indication that a chemical reaction was occurring.
But the spectrometer told a different story. The Mugyeong compounds in the blood were responding to the raw fluid — not integrating further (they were already at equilibrium) but *reorganizing*. The stabilized compounds in the blood shifted their molecular configuration, rearranging into a new structure that the spectrometer classified as—
Sera stared at the readout.
"That's not possible," she said.
"What?" Shin was at her shoulder.
"The compounds reorganized into a tertiary structure. Not Mugyeong, not terrestrial. A third configuration. The blood's integrated compounds are using the raw fluid as a template to build something that doesn't exist in either biology independently."
The reaction vessel contained a new substance. Dark, like the fluid, but with a different viscosity — thicker, almost gelatinous, with a faint violet tint that caught the light the way the synthesized mana crystals did. It sat in the vessel like something that had been waiting to be born.
Sera held her hand over the vessel. [Brew] activated — and this time, despite the tablet, despite the digital interface, despite the 20% reduction in probability reading clarity—
[Brew] lit up.
Not the muted flicker she'd been enduring since the notebook confiscation. Full activation. Bright, clear, immediate probability trees unfolding in her perception like a flower opening. The new substance was an ingredient — an ingredient that [Brew] recognized, cataloged, and began generating recipes for with an enthusiasm that bordered on hunger.
The probability trees were dense. Dozens of branches, each one a recipe using the new substance as a base. B-rank, A-rank, S-rank. The branches kept climbing. Higher. Past S-rank. Into the space she'd only glimpsed inside the gate—
The System notification hit.
**[WARNING: Ability Holder #KR-0847-BREW]**
**[An unclassified substance has been detected in your workspace. This substance does not match any registered compound in the System database.]**
**[Classification: PENDING]**
**[This substance will be monitored until classification is complete.]**
Pending. Not Protocol-Restricted. Not Protocol-Monitored. *Pending.*
The System didn't know what it was.
Sera read the notification three times. Every potion she'd ever brewed, every crystal she'd synthesized, every compound she'd created — the System had classified them instantly. Protocol-Monitored or Protocol-Restricted, within seconds of creation. The System's taxonomy was comprehensive. It had categories for everything.
Except this.
The substance in the reaction vessel existed in a space the System hadn't mapped. Born from the merger of stabilized hybrid blood and raw extradimensional fluid, it occupied a taxonomic gap — too complex for the System's existing categories, too novel for instant classification.
The System was thinking about it. And while it thought, the substance wasn't restricted. Wasn't tracked. Wasn't flagged.
For the first time in thirty-seven days, Sera had created something the System couldn't immediately control.
"Shin." Her voice was steady. The rest of her wasn't. "Close the lab. Nobody in or out. Don't log this experiment on the shared system."
"The pre-approval protocol—"
"Was for a blood interaction study, which this is. The results are unexpected. I need time to analyze before I report."
Shin hesitated. The pre-approval protocol required real-time logging of experimental results. Not logging was a violation of the new rules — the rules that existed because Sera had already caused a security breach by being careless with information.
But Shin had watched the System notification. She'd seen the word *PENDING*. She understood what it meant — that for a brief, uncertain window, Sera had room to work without the System watching over her shoulder.
Shin closed the lab's external communications. Logged the experiment as "in progress — preliminary data collection" on the shared system. A technically accurate description that revealed nothing.
Min-su watched from his corner. He'd been watching throughout. His hand wasn't on his sidearm — it was on the workbench, resting near the reaction vessel, as if guarding it.
The rat was pressed against the bars of its cage, both forelegs extended toward the vessel, its crystalline structures pulsing with the same violet tint as the new substance. It recognized what Sera had made. Recognized it the way a parent recognized a child — not with surprise, but with the deep, structural familiarity of shared biology.
Sera looked at the substance. The substance caught the fluorescent light and held it, bending it through angles that belonged to neither this dimension nor the one the gate occupied.
Something between worlds. Something the System couldn't name.
She picked up the stylus. Drew it across the tablet. [Brew]'s probability trees blazed through her perception, clear and bright and full of recipes she'd never imagined.
*Day 37*, she wrote. *I made something new.*
*The System doesn't know what it is yet.*
*I have until it figures that out.*
