Black Box: Flight 704

The smell of burned fuel is something the human brain never forgets. It clings to olfactory memory with the same force that terror clings to the bones.

For Han Ha-Eun, that smell was always accompanied by the deafening sound of choking turbines and the frantic flashing of red emergency lights. She was fifteen years old when she learned that life could fracture in a matter of seconds—exactly the number of seconds it takes for a commercial airplane to fall from the sky.

It had all begun as the perfect trip. Flight 704 was returning to Seoul after an idyllic family vacation. Ha-Eun remembered leaning against the window, absentmindedly drawing on the fogged-up glass while her mother stroked her hair and her father read the newspaper from the aisle seat. The world was a safe, warm, and predictable place.

And suddenly, it no longer was.

The first sign was a violent jolt that sent plastic cups and trays flying through the air. Then came a nosedive that robbed her of both her breath and gravity. Oxygen masks dropped from the ceiling like lifeless pendulums, swaying to the rhythm of the panic erupting throughout the cabin. The passengers’ screams blended with the captain’s metallic, agitated voice over the loudspeaker, ordering the crew to prepare for an imminent impact.

When the plane’s wheels slammed brutally against the asphalt of a remote emergency runway, the impact threw them forward. The screech of metal against the ground was deafening. Orange sparks illuminated the darkness of the night outside as the steel colossus skidded out of control before coming to an abrupt stop.

“Evacuate! Evacuate immediately!” the flight attendants shouted as they opened the heavy emergency doors. The inflatable slides deployed with a sharp hiss.

Chaos took over the aisle. Smoke began seeping in from the rear of the plane, thick and suffocating. Blinded by survival instinct, people pushed with brutal force. Ha-Eun felt her mother’s hand, which until that moment had been desperately gripping hers, begin to slip away under the pressure of the crowd.

“Mom!” Ha-Eun screamed, coughing as the black smoke already filling her lungs made it harder to breathe.

“Don’t let go, Ha-Eun! Keep moving!” were the last words she heard her father say before a wave of terrified passengers pushed her toward the exit over the right wing.

Unable to stop herself, she was thrown down the inflatable slide. The freezing night air struck her face as she landed on the damp grass and cracked asphalt. She stumbled to her feet, her knees scraped and her heart pounding wildly in her throat.

She immediately turned toward the wounded metal monster. Dozens of people were running frantically into the darkness, getting as far away from the aircraft as possible, but Ha-Eun remained there, frozen, barely twenty meters from the fuselage, searching for the familiar faces of her parents among the survivors coming down the slides.

“Mom! Dad!” she screamed, her voice breaking.

No one answered. The hum of the right engine, still spinning unnaturally, produced a high-pitched, almost painful whine. A thick smell of kerosene saturated the air.

Instinctively, Ha-Eun took a step forward.

She had to go back.

She had to help them get out.

“They have to get out!” she sobbed, preparing to run back toward the smoking structure.

But before her right foot could touch the ground again, the world went silent for a fraction of a second.

Absolute silence, as if the entire universe had held its breath.

And then, hell erupted.

The plane’s right engine exploded with cataclysmic force. A colossal ball of brilliant, blinding orange fire devoured the center of the aircraft, splitting the fuselage in half. The shockwave struck Ha-Eun like an invisible, burning wall, throwing her backward onto the ground.

The heat was so intense that she felt as though it were burning her eyelashes. The roar of the explosion shattered her eardrums, leaving her in a state of absolute shock. Lying on the ground, her eyes fixed on the flames rising into the night sky, her young mind could not process what had just happened.

Her parents were in there.

Her parents were inside that inferno.

A heartbreaking, animalistic, primal scream tore from her throat.

“MOM!”

She jumped to her feet, blinded by tears and desperation, and ran straight toward the flames. She didn’t care about the heat. She didn’t care about death.

She only wanted to reach them.

But she didn’t get very far.

A pair of arms wrapped around her from behind with unstoppable force. Someone intercepted her in the middle of her run, colliding with her and locking her in a firm embrace that forced her to stop abruptly. The momentum sent them both crashing to their knees on the asphalt.

“Let me go! They’re in there! I have to go!” Ha-Eun twisted like a wounded animal, throwing blind punches behind her, kicking the ground, clawing at the arms holding her like an iron lock.

“Don’t look. Don’t go in there.”

The voice sounded right beside her ear.

It was a male voice.

Young, yet filled with a strange gravity, deep and measured. A voice that contrasted almost surrealistically with the deafening chaos of sirens, screams, and crackling fire.

“Let me go, please!” Ha-Eun begged, losing her strength as the smoke and pain stole the air from her lungs.

“Stay with me. Don’t move. You’ll be safe.”

The boy, whose face she couldn’t see, held her even tighter. One of his hands gently pressed Ha-Eun’s head against his own chest, shielding her eyes so she wouldn’t see the plane being consumed by the blaze.

She stopped fighting.

Her body surrendered to exhaustion and trauma, and she clung to the stranger’s jacket, burying her face against his chest.

There, surrounded by hell, Ha-Eun noticed a scent that did not belong to the tragedy: fresh rain, clean clothes, cedarwood.

And beneath her cheek, the fast but steady beat of someone else’s heart.

That heartbeat and that voice were her only anchors to sanity as her world finished burning.

Six years later.

Ha-Eun’s eyes flew open.

Her breathing was shallow and erratic. She was sitting upright in bed, the sheets tangled around her legs and her forehead covered in cold sweat.

The gray light of dawn filtered through the curtains of her austere bedroom. It took her a few seconds to recognize her surroundings: the white walls, the meticulously organized desk, the physics and aerodynamics books stacked on the shelves.

She was no longer fifteen.

She was no longer on that remote runway.

She brought her trembling hands to her face and rubbed her eyes, trying to erase the image of the flames. Like almost every night since the Flight 704 accident, the nightmare had returned to visit her.

And always, without exception, the dream ended the same way: with the echo of that deep voice vibrating through her memory.

“Stay with me. You’ll be safe.”

After her parents’ deaths, Ha-Eun’s life had been taken over by her paternal uncle, Han Sung-Min. Officially, he had taken her in out of familial love, but behind the doors of the enormous, cold Han family mansion, the reality was very different.

The ink on the death certificates had barely dried when her uncle took absolute control of H-Aero, the thriving aviation-parts development company her father had built from the ground up.

The accident was quickly classified by the authorities as a “catastrophic maintenance failure,”and the case was closed with a speed that had always seemed suspicious to young Ha-Eun. Her uncle took care of the settlements and silenced the press.

Everything returned to normal far too quickly for everyone.

Everyone except her.

Ha-Eun got out of bed, shaking her head to dispel the ghosts of the past. She walked toward the bathroom mirror and looked at herself.

At twenty-one, her features had sharpened, losing the roundness of childhood. Her dark eyes, once lively, now held a cold and calculated determination.

Today was not just another day.

Today was the first day of the rest of her life.

For six long years, she had subjected herself to an almost military study regimen. While girls her age went to parties, fell in love, or traveled, she memorized aeronautical manuals, safety codes, and aviation laws.

All for the chance to walk through the gates of one place:

Hanguk National University of Aviation, the most exclusive civilian and military institution in South Korea.

But her goal wasn’t to graduate with honors and work for an airline.

Hidden beneath Hanguk’s facilities was the National Aviation Safety Archive.

There lay the original black boxes, unedited forensic reports, and classified records of every aviation incident in the country.

Including Flight 704.

She put on her faculty uniform: an immaculate navy-blue skirt, a white shirt, and a narrow tie. She grabbed her backpack and went downstairs to the enormous dining room.

Her uncle was already there, reading the financial news on his tablet while drinking black coffee.

“Good morning,” Ha-Eun murmured politely without stopping, heading directly toward the door.

Her uncle barely lifted his gaze.

“I hope this little obsession of yours with airplanes ends when you graduate, Ha-Eun. Next year, you’ll reach the age required to sit on the board of directors as a minority heir. I need you to learn about business, not defective engines.”

Ha-Eun stopped with her hand on the doorknob.

She clenched her teeth.

Minority heir.

He had made sure to dilute her parents’ shares so he could maintain control.

“It’s just a university degree, Uncle. I’ll see you at dinner,” she replied monotonously, quickly leaving the mansion before he could add anything else.

The subway ride to the outskirts of the city helped calm her nerves. When she finally arrived at the gates of the enormous Hanguk University campus, the sheer size of the place briefly overwhelmed her.

Glass-and-steel buildings towered over green spaces and practice runways. The sound of small aircraft engines and flight simulators filled the air. Students in immaculate uniforms, many of them future commercial pilots and aerospace engineers, hurried along the wide boulevards.

Ha-Eun ignored the freshman orientation event.

She wasn’t there to make friends.

She pulled a campus map from her pocket and traced an imaginary line toward the Flight Engineering and Safety Building.

The inside of the building was silent, with polished marble floors reflecting the fluorescent lights. She approached the archive library desk, a semi-restricted area where students from research faculties could access public reports.

“I’m Han Ha-Eun, a first-year Accident Investigation student,” she said, showing the librarian her newly printed university ID. “I’d like to request the public records for commercial Flight 704 from six years ago.”

The man, an older adult with thick glasses, typed on his computer, oblivious to the emotional storm raging inside the girl standing before him.

“That’s an old and closed case. I only have access to the executive summary and the basic structural analysis,” he explained, pulling a thin folder from a nearby filing cabinet and sliding it across the counter. “The technical appendices, cockpit transcripts, and raw black-box data are on Level B. It’s a classified area restricted to authorized professors and senior faculty officials.”

Ha-Eun nodded and took the folder.

She knew it wouldn’t be that easy, but she needed a starting point.

She walked toward one of the side corridors, opening the folder as she went. Her eyes quickly scanned the printed pages.

Engine diagrams.

Airline maintenance records.

Departure schedules.

But when she reached the final report on the right engine, she frowned.

The diagnostic codes from the forty-eight hours before the flight were missing.

The report jumped directly from a routine inspection to the explosion.

There was no chain of events.

It was as if an entire chapter had been cleanly torn out of the book.

“This doesn’t make sense,” she murmured to herself, absorbed in the papers and losing all awareness of her surroundings. “Overheating doesn’t happen from one second to the next without leaving a record in the ground sensors…”

Ha-Eun walked quickly through the wide main corridor, which at that hour was beginning to fill with students changing classes. Her head was down as she read and reread the same line of the report, trying to find some logical opening.

About thirty meters away, walking in the opposite direction, was a group of students from the elite pilot program.

It was obvious which faculty they belonged to from the military cut of their uniforms and the way they walked.

And at the center of them, effortlessly leading the group, was Yoo Kang-Jun.

Kang-Jun was a legend on campus long before graduating.

Tall, broad-shouldered, with perfect posture.

His black hair fell slightly over a sharp, dark gaze that seemed to judge and dismiss everything around him in fractions of a second. He carried several folders and manuals under one arm.

He was known for two things: his grades, which bordered on inhuman perfection in the flight simulators, and his personality, so icy and cutting that no one, not even his closest classmates, dared to cross certain lines with him.

Ha-Eun wasn’t paying attention to the approaching group of pilots.

She was so focused on page three of the report that she didn’t notice a pair of engineering students running behind her, arguing and playfully shoving each other.

One of the engineers, trying to dodge his friend, blindly stepped to the side and slammed violently into Ha-Eun’s shoulder.

The impact threw her off balance.

“Ah!” Ha-Eun exclaimed, dropping her folder as she lost her balance and fell forward.

She never hit the floor.

She crashed directly into a solid wall dressed in a navy-blue uniform.

The impact forced Kang-Jun half a step backward and sent all his flight manuals crashing onto the marble floor with a dull thud, mixing with Ha-Eun’s papers about the Flight 704 accident.

A tense silence immediately fell over that section of the hallway.

Kang-Jun’s classmates stopped, watching the scene with a mixture of surprise and sympathy for the girl who had just collided with the wrong person.

Dazed, Ha-Eun quickly steadied herself and instinctively crouched down to pick up the mess.

“I… I’m so sorry. Someone pushed me and I couldn’t…” she began apologizing as she gathered random sheets of paper.

Kang-Jun was already crouching in front of her.

With quick, precise movements filled with obvious irritation, he began separating his manuals from her papers.

His face was a mask of ice.

At first, he didn’t even look her in the eyes.

He finished stacking his books, grabbed Ha-Eun’s blue folder with its half-disorganized pages, and held it out to her with a tense gesture.

“Don’t you watch where you’re going?” Kang-Jun said.

It was a simple sentence.

An ordinary reprimand.

But the instant those syllables left his mouth, Ha-Eun’s world stopped for the second time in her life.

Her fingers froze inches away from taking the folder.

Her eyes, which until then had been fixed on the papers, snapped violently toward the boy’s face.

The timbre of his voice.

The deep vibration in his chest.

That almost imperceptible pause between words, filled with a strange gravity.

It was him.

He didn’t sound like him.

He didn’t remind her of him.

It was exactly the voice that had visited her nightmares every dawn for the last two thousand one hundred and ninety days of her life.

The voice that had begged her not to look at the fire.

The voice that had held her when the world was falling apart.

A dense, paralyzing electric shiver ran down Ha-Eun’s spine.

Her breath stopped short.

Suddenly, she could no longer smell the wax on the university’s marble floors.

She could smell burned kerosene again.

She could feel the scorching heat against the back of her neck again.

Kang-Jun noticed that the girl in front of him wasn’t taking the folder and was staring at him as though she had just seen a ghost.

His frown deepened.

He clicked his tongue lightly in annoyance and dropped the folder into her paralyzed hands.

He stood up, brushed invisible dust from his jacket, and without another word, continued walking, passing her as if she were nothing more than an irrelevant obstacle in his path.

Ha-Eun blinked, snapping out of her trance.

Her heart was pounding so hard she could hear it in her ears.

She stood up clumsily, clutching the folder against her chest, and turned toward the back of the boy walking away.

“Wait!”

The shout escaped her lips before her brain could stop it.

It was loud.

Almost desperate.

A few students in the hallway turned to look.

Kang-Jun’s friends stopped.

And Kang-Jun, reluctantly, stopped walking.

He let out a heavy sigh, visible even from where she stood, and slowly turned around, slipping one hand into his trouser pocket.

He looked at her.

Really looked at her this time.

His black eyes traveled over Ha-Eun with cold, analytical precision, from her hair, slightly disheveled from the collision, to her hands gripping the papers so tightly that her knuckles had turned white.

“What is it now?” he asked.

And once again, that voice sent a surge of adrenaline through Ha-Eun’s entire nervous system.

She took a step toward him.

Her legs were trembling, but her eyes burned with a mixture of shock, accumulated pain, and a desperate hope.

She studied him, searching for any trace of recognition.

Any sign that he remembered the fire too.

“You…” Her voice trembled, breaking on the final syllable. “Don’t you remember me?”

The question hung in the heavy air of the corridor.

Kang-Jun’s friends exchanged amused glances, thinking it was just another desperate attempt by a freshman to flirt with the academy’s star.

But Kang-Jun didn’t smile.

His expression didn’t change in the slightest.

His face remained unreadable, as if carved from granite.

He held Ha-Eun’s gaze for several seconds that felt like hours, analyzing the intensity of her tear-filled eyes.

Finally, a distant, arrogant half-smile, empty of any emotion, appeared on his lips.

“Don’t dream so much, freshman,” he replied in an icy, weary tone. “I don’t know you at all. If you want to get the attention of upperclassmen, come up with a less pathetic excuse next time.”

The blow was brutal.

It was as if someone had dumped a bucket of ice-cold water over her head.

Before Ha-Eun could react, form a word, or defend herself, Kang-Jun turned around and resumed walking down the main hallway, his friends following closely behind and murmuring between laughs.

Ha-Eun remained there, alone in the middle of the flow of students as everything around her returned to normal.

She pressed the folder against her chest so tightly that the cardboard bent.

“I don’t know you at all.”

The words echoed in her mind.

It was impossible.

His voice was identical.

His height matched.

The feeling of his presence was like a living ghost.

Had she gone crazy?

Had she imagined her savior’s voice so many times that she was now projecting it onto the first arrogant student who crossed her path?

She looked toward the end of the hallway, where Kang-Jun’s figure had already disappeared around the corner.

A visceral instinct, stronger than reason and more stubborn than pain, ignited inside her.

Ha-Eun didn’t believe in coincidences.

She had come all this way chasing ghosts, and if that cold, arrogant boy was one of them, she had no intention of letting him go until she got the truth out of him.