The cytometer's blue light swept across the skin of her inner arm. Seojin held her breath. The microscopic markers coursing through her bloodstream caught the light and threw back their own separate fluorescent signals. On the screen, a river made of millions of points unfurled. Green and red, and the orange ones she watched most closely of all. Tumor activity marker TK1. Her ticket to Mars.
When the analysis finished, the machine gave a low tone. The medical technician checked the figures on the screen, then turned to Seojin with no expression at all.
"Stable."
That single word chilled Seojin's heart to the bone. Stable. The word she'd heard for three months straight now. To the people who'd be left behind on Earth, it would sound like a blessing; to her, it was a death sentence. The technician transmitted the data and walked her through the next steps. Seojin nodded mechanically and stood. The cold film of disinfectant gel still clung to her arm, sharp and clear.
Back in her private quarters, Seojin switched on the display that covered the entire wall. Red dunes and a thin atmosphere conjuring a sky the color of pale pink. A panoramic image shot from the summit of Olympus Mons on Mars. The very site she'd made the subject of her dissertation four years ago, during her doctorate. Back then she'd been a researcher parsing data on a screen; now she was set to become the first geologist ever to set foot there in person — provided she held onto her qualification: a death sentence of six months or less.
Ares 7. Humanity's first one-way migration mission to Mars. There was exactly one qualification for applying: be the foremost expert in your field, and have a life expectancy under six months. Earth's resources couldn't stretch to sending a round-trip shuttle. So humanity chose instead to send its most efficient resource — people who had no need to come back. Society called their ending a "noble sacrifice"; the media praised it as "humanity's final service." To Seojin, it was simply a chance to blaze across the red planet instead of guttering out on a hospital bed.
Stage 4 brain tumor. A year ago, the doctor had said it without a trace of feeling. Six months on average. Eight, at most. From the bottom of that despair, Seojin saw the Ares 7 recruitment notice. It was salvation. Her death was no longer a meaningless extinguishing — it had a destination now. She poured ten years of research into her application, and after seven grueling months of screening and training, she was chosen, in the end, as head of geological research — mission commander.
The problem was that her body had begun breaching the contract. Seojin synced her wrist terminal to her personal medical database. The results from the test just now had already come through. The TK1 marker reading had bent downward at the very last point on the graph. 0.8. Last month it was 1.1; the month before, 1.9. A healthy person's reading sat under 0.1. She still had a long way to fall, but it was the direction that was the problem. The graph was tracing an unmistakable path toward remission. Her body was betraying her dream.
"A perfect malfunction."
The words slipped out on their own. Her healthy immune system was attacking the tumor cells of its own accord. Three weeks remained until the colony ship launched. If she couldn't reverse this trend before then, she would be disqualified and left behind on Earth. A terminal cancer patient again. But this time, one who had lost Mars as a destination.
* * *
The next day, Seojin sat in the mess hall with the other candidates. Every one of them had reached the pinnacle of their field — a renowned biochemist, a top-tier pilot, a master of botany. And every one of them was dying. That fact bred a strange calm among them, a kind of camaraderie. Death was no longer something to fear; it was a shared qualification.
"Did you see the aurora simulation yesterday? The artificial aurora the magnetic field generator makes. It was really beautiful."
Mina, sitting across from her, said it. She was the mission's life support systems chief. Terminal pancreatic cancer. Her face was gaunt with illness, but her eyes always shone as if dreaming of something.
"Once we reach Mars, we'll see a real aurora. A blue one, nothing like Earth's."
Seojin answered dryly. Mina set down her fork and looked at her quietly.
"Sometimes, Commander, you sound just like a database talking. Precise, airtight. But it's like you never feel a flicker of excitement."
"Excitement is just an unnecessary variable in mission execution."
"Is it? I feel like I could die from excitement. If I'm going to die anyway, turning to dust beneath a blue Martian aurora is so much more wonderful. The carbon that made up my body might someday become fertilizer that grows Martian plants."
There was no resignation in Mina's voice, no sorrow. Only pure anticipation filled it. Watching her, Seojin hid her own restlessness. Mina had accepted her death completely. Her body was advancing steadily toward it, right on schedule. Seojin envied her.
Leaving after the meal, she ran into Dr. Yoon in the corridor. He was the chief medical officer of the Ares 7 project. He always wore a gentle smile, but his eyes seemed to see through everything.
"Commander Seojin. Do you have a moment?"
The infirmary was filled with the cold hum of machines and the smell of medicine. Dr. Yoon pulled up Seojin's medical data on the large screen.
"The recent downward trend in your TK1 marker levels is rather noticeable."
He said, pointing to the tail end of the graph. Seojin felt her heart drop, but she kept her expression steady.
"Isn't that within the margin of error?"
"Of course, it could be. But three consecutive months of movement in the same direction is hard to dismiss as simple error. Medically speaking, it's a very positive sign."
Dr. Yoon's voice was soft, but its content cut like a blade. 'A positive sign.' Just like Mina's words, that phrase was negating Seojin's entire world.
"It's very rare, but spontaneous remission does occur in terminal cancer cases. A kind of miracle, really."
Dr. Yoon looked Seojin straight in the eye. His gaze was not simply that of a doctor. It was the gaze of a qualifications examiner.
"I think we'll need a more thorough examination before final boarding clearance. Tomorrow morning, we'll do a deep brain tissue biopsy. That will settle things once and for all."
It had finally come. She might have been able to explain away the blood markers somehow, but a test that cut tissue directly from her brain and analyzed it could not be fooled. It would show, unmistakably, that the tumor's activity had declined. And then everything would be over.
"Understood."
Seojin gave the brief reply and left the infirmary. Her legs shook the whole way down the corridor. She resented her own body. Why now, of all times, did it choose to fight back? What had all those months battling the pain that had tormented her for the past year even been for? Now, at the eleventh hour, this will to live was stealing away her last hope.
* * *
That night, Seojin shut herself in her room and searched for a solution. She marshaled every scrap of scientific knowledge she had. Ways to artificially disrupt the immune system. Drugs that would trigger an extreme surge of stress hormones. Deliberate exposure to radiation to accelerate cell division. All of it was too dangerous, too obvious. Dr. Yoon would see through a trick that crude in an instant.
She changed her approach. If she couldn't fool her own body, she would have to fool the machine. The deep-tissue brain biopsy analyzer measured the metabolic activity of tumor cells by optically scanning the extracted sample. If only she could tamper with that data. But the testing system ran on a closed network, completely isolated from any outside connection. Without physical access, it was impossible.
Seojin looked at the training manual lying on her desk. Ares 7 Mission Commander Field Protocols. It contained a range of procedures for accessing control systems in an emergency. The medical system's master code was among them. But even knowing the code, altering the data in real time while the test was actually running was next to impossible.
Time passed. Beyond the Martian landscape on her wall screen, night deepened over Earth. Seojin weighed every possibility and crossed them off one by one. What remained was despair alone. She switched off the display. When the red planet vanished, she saw, in the darkness, her own face reflected in the monitor. A face with no trace of illness in it — a face that looked, infuriatingly, healthy. Tears ran down over it.
That was when it happened. A short message arrived on her terminal.
'Infirmary server room. Three minutes.'
There was no sender.
Seojin hesitated. It could be a trap. But it was better than sitting still and waiting for her disqualification. She quietly opened her door and stepped into the dark corridor. In the dead of night, every light in the training facility was off. Only the green glow of the emergency guide lamps lit the floor.
The infirmary wing was deserted. The server room door was locked, but a small memory chip had been left beside the card reader. When Seojin plugged it into her terminal, an anonymous protocol ran and released the lock. The door slid open without a sound.
Inside, the server room was filled with the fan noise of dozens of data servers and cold, chilled air. In one corner stood someone.
It was Dr. Yoon.
He didn't seem the least surprised to see Seojin. His expression was calm, as if he'd known all along that she would come.
"I knew you'd come."
"What is this—"
"You're not very good at lying, Commander. Your face was perfect, but you kept your hands hidden the whole time. You didn't want anyone to see them shaking."
Dr. Yoon walked to the medical data server at the back of the room. On the screen was the sequence profile for tomorrow's deep-brain tissue scan.
"Right before the test, this system references past data to set a comparison baseline. And if that past data happens to contain... a bit of noise, the system will end up interpreting tomorrow's results against that noisy baseline."
He set his hands on the keyboard and typed a few commands. Seojin's past blood marker data appeared on the screen. Dr. Yoon pointed to her TK1 levels over the past three months.
"This downward trend is too... perfect. It looks like something out of a textbook. Real biological data is never this clean. There's always irregular noise mixed in."
His fingers moved. He began adding tiny fluctuations to the graph. The values crept up a little, dropped back down, spiked suddenly, then settled—an unpredictable pattern taking shape. The overall trend still pointed downward, but the process itself looked like pure chaos.
"With this much noise, the system will read tomorrow's low reading as a 'temporary plateau.' Measured against the past data, it will conclude you're in an unstable state that could spike again at any moment. Under protocol, an 'unstable terminal condition' still satisfies the eligibility requirement."
Seojin held her breath, watching his fingers move. The man who was both her doctor and her examiner was circumventing the very rules he was sworn to enforce.
"Why... why are you doing this?"
Dr. Yoon stopped typing but didn't take his eyes off the screen.
"My wife died of a brain tumor too. Three years ago. If the Ares program had started just a little earlier, she would have applied. She was an astronomer. A woman who spent her whole life looking at the stars—in the end, she would have wanted to become one."
For the first time, his voice trembled, faintly.
"As a doctor, it's my duty to keep you on Earth and treat you. But... I don't want to watch one person's last dream get crushed over a few lines of data. Ares 7 needs a geologist. Not just another cancer patient."
He pressed Enter, saving the falsified data. Then he logged out of the server. It was the 'perfect malfunction' he had engineered.
"I'll see you in the examination room tomorrow, Commander."
Dr. Yoon brushed past Seojin's shoulder and left the server room. She stood there for a long while, staring at the distorted graph of her own biological data. A contradiction between a body determined to survive and a will determined to leave. She would have to embrace that contradiction and walk forward into a false hope.
The next day, the deep brain tissue biopsy was performed. Seojin lay on the cold examination table and surrendered everything to the machines. The extracted tissue went into the analyzer. Dr. Yoon studied the results as they appeared on the monitor. His expression didn't change at all.
"Test complete. The results are... consistent with previous data. Condition remains unstable. No issues for boarding."
He said it without looking at Seojin. It was an official declaration. Seojin closed her eyes. Along with relief came a guilt she couldn't quite name. She was deceiving her own life, deceiving her colleagues, deceiving the great mission itself, carried out in humanity's name.
Launch day approached. The candidates passed their final physicals, packed their personal belongings, and recorded their last messages to leave behind on Earth. Seojin left a message for no one. Everything she had was on Mars.
D-1 to launch. All crew boarded the colony ship Odysseus. They made their way down the narrow corridor and strapped themselves into their seats. Seojin sat in the commander's chair and opened the final communication link with mission control. Through the headset came Mina's excited voice.
"We're finally going, Commander. Off to see that blue aurora."
Seojin gazed out the window at Earth. A planet like a blue marble. A place she would never return to again. She was rejecting the miracle her own body had produced, leaning instead on one doctor's silence, and leaving this place behind. Was this truly the right choice? She had no way of knowing.
The countdown began. 10, 9, 8… A massive vibration shook the entire hull. Seojin looked down at her hand gripping the control stick. A hand without a single tremor. A hand disturbingly healthy. With that hand, she was about to begin a new chapter of human history.
With a roar that thrust the launch vehicle upward, her body sank deep into the seat. The view outside the window fell away at a furious speed. The blue planet grew smaller and smaller in her sight. In that instant, a faint pain flashed through Seojin's head like lightning. She couldn't tell if it was real pain, or an illusion conjured by guilt. She closed her eyes. In the darkness, the false graph Dr. Yoon had made for her rose up, vivid and clear.
The Odysseus flew on through silence for seven months. The stillness of space resembled what lay within Seojin. She was the perfect commander. She responded to every emergency with cool precision, and managed the crew's physical and mental states without the slightest margin of error. While absorbed in the mission, she could, for a while, forget the quiet rebellion her own body was waging. The guilt grew faint beneath the weight of daily protocol.
But machines did not lie. On the day of her quarterly self-checkup—held once every three months—Seojin entered the medical module alone. She pressed the cytometer to her own arm. Millions of points bloomed across the screen. The orange TK1 marker now looked less like a river than a faint trickle. The reading: 0.2. A state of remission so complete that Earth's medicine could not explain it. Only the ghost of the data Dr. Yoon had planted still precariously proved her fit to fly. She switched off the screen. The miracle was just another name for the sentence.
When Mars filled the window like a vast red eye, Mina came to stand beside Seojin. She had grown visibly frailer, but her eyes still shone as though they held the whole universe.
"Look, Commander. That's where we'll sleep."
Mina's voice was calm. She accepted her own death without a shadow of doubt, and she loved the thought of that final destination. Watching her, Seojin couldn't bring herself to speak. Mina was thrilled that the elements making up her body would soon become part of Mars. But Seojin, in her perfect health, was fated to be exiled to that red planet forever.
"Commander... you seem like you'll live forever. You never once say you're in pain."
Mina's innocent admiration lodged in Seojin's heart like a blade. Instead of answering, she gave Mina's shoulder a light pat.
The landing was as precise as a textbook diagram. On the plain south of Arsia Mons, at the appointed site, the Odysseus touched down gently. A chorus of congratulations from all of humanity rang through the ship, but to Seojin it was only distant, hollow noise. When every procedure was complete, the hatch finally opened. The moment humanity's first Martian settlers would take their first step. That honor belonged to her, the commander.
Through her helmet visor she saw a pale pink sky and an endless red expanse stretching before her—the landscape she'd studied a thousand times over, only ever as images and data. But there was none of the wonder she'd felt watching it on-screen. Instead, an overwhelming solitude pressed down on her, as if she stood at the entrance to some vast tomb. She had come here to die, but now it was her life that would be imprisoned here.
"Commander, history awaits you."
The voice from Mission Control crackled through her headset. Seojin descended the ramp slowly. The instant her foot touched the ground, a fine red dust rose up. A historic first step. But she felt nothing at all. This was not a new beginning—it was the start of an endless ending.
She bent at the waist. With a gloved hand she scooped up a fistful of Mars's cold soil—the soil she had devoted her whole life to studying, soil that held unknown minerals and ancient traces. She would have to spend decades more analyzing this dirt, unearthing the planet's secrets. In a prison far vaster, and far lonelier, than any hospital bed.
Seojin slowly opened her hand. Red sand slipped through her fingers, scattering carelessly on the wind.
