The Haeju Financial Data Complex rose from the eastern edge of the city like a tombstone, a thirty-story slab of concrete and mirrored glass that seemed to absorb light rather than reflect it. By the time Yuna arrived, the afternoon had thickened into a pale gray haze, the kind of weather that made the city feel like a photograph left too long in the sun. She parked her unmarked sedan in the visitors' lot and sat for a moment, studying the building through her windshield.
She had been here before, years ago, during a joint investigation into an insider trading ring at a pharmaceutical company. The case had gone nowhere. The suspects had lawyered up, the evidence had evaporated, and her superiors had told her to drop it. She had learned two things from that experience: first, that the Financial Data Complex was a fortress, its security protocols designed to protect the integrity of the market's information. And second, that the people who worked inside it were not her allies. They were civil servants, loyal to their hierarchy, and they would not volunteer information that might embarrass their institution.
She stepped out of the car and walked toward the main entrance. The lobby was a cavern of polished stone and indirect lighting, designed to impress upon visitors the seriousness of the work conducted within. A security guard sat behind a curved desk, watching her approach with the practiced indifference of someone who had denied entry to a thousand people before her.
Yuna held up her badge. "Detective Choi, Financial Crimes Division. I need to speak with the supervisor of the night-shift data analysts."
The guard examined her badge with exaggerated care. "Do you have an appointment?"
"I have a death investigation. That takes precedence over appointments."
The guard's expression did not change. He picked up a phone and murmured into it. Yuna waited, her patience held together by years of practice. After three minutes, a woman in a gray suit emerged from the elevator bank and walked toward her with the brisk stride of someone who had been interrupted in the middle of something important.
"Detective Choi? I'm Director Park Soo-kyung, Operations Division." She did not offer her hand. "What is this regarding?"
"A trade placed from this building at 2:13 AM this morning. I need to know who placed it."
Director Park's face was a mask of professional neutrality. "The SEC handles inquiries into trading activity. You should direct your questions to them."
"I already have. They traced the trade to an IP address on the seventh floor. That's your jurisdiction."
A flicker of something passed across Director Park's eyes. Annoyance, or perhaps caution. "The seventh floor houses the Market Surveillance Archive. The analysts who work there have access to historical trading data, but they do not execute trades from their workstations. It would be a violation of about a dozen protocols."
"I'm not interested in protocols. I'm interested in a dead woman."
Director Park's jaw tightened. She glanced at the security guard, then back at Yuna. "Come with me."
They rode the elevator in silence. The seventh floor was a maze of cubicles and server racks, the air cold and dry, scented with the faint electrical ozone of ten thousand processors running in parallel. Most of the workstations were empty at this hour, their occupants having gone home after the day shift. A few analysts remained, their faces illuminated by the blue glow of monitors, their fingers moving across keyboards in the automatic rhythms of long practice.
Director Park led her to a glass-walled office at the far end of the floor. Inside, a man in his fifties sat behind a desk cluttered with reports. His nameplate read "Chief Analyst Hwang Jae-sik."
"This is Detective Choi," Director Park said. "She has questions about a trade placed from this floor."
Hwang Jae-sik looked up, his expression wary. "What trade?"
Yuna placed a printout on his desk. "A short position on K-Tech Industries, executed at 2:13 AM. The audit trail points to an IP address registered to your division."
Hwang picked up the printout and studied it. His face revealed nothing, but Yuna noticed his fingers tighten slightly on the paper. "This IP address corresponds to a workstation in the night-shift pool. Anyone on the shift could have used it."
"How many people work the night shift?"
"Seven analysts. Plus a supervisor."
"I need their names."
Hwang hesitated. He looked at Director Park, who gave an almost imperceptible nod. "I can provide the names," he said. "But I should tell you, none of these analysts have the authority to execute trades from their workstations. The network is firewalled. Financial transactions are blocked."
"Someone found a way around the firewall."
"Or your audit trail is wrong."
Yuna met his gaze. "The SEC doesn't think it's wrong."
Another pause. Hwang opened a drawer and removed a personnel roster, sliding it across the desk. Yuna scanned the names. Most were unremarkable, junior analysts with a few years of experience. But one name caught her attention: Kang Min-jun.
She recognized the family name. Kang was common enough, but something about it triggered a memory. She had worked a case years ago, a pharmaceutical fraud investigation that had crossed her desk briefly before being transferred to another division. The name Kang had been in the file. She could not recall the context, but the association lingered.
"How long has Kang Min-jun worked here?"
Hwang consulted his records. "Five years. He transferred from the private sector. Good analyst. Quiet. Keeps to himself."
"I need to see his workstation."
Director Park stepped forward. "Detective, I've been cooperative, but I need to remind you that without a warrant, I cannot allow you to access our systems or interrogate our staff. You can observe the workspace, but that is all."
Yuna nodded. She had expected this. "Show me."
They walked through the cubicle maze to a workstation near the back wall. It was indistinguishable from the others: a standard-issue desk, a dual-monitor setup, a keyboard worn smooth by years of use. There were no personal effects, no photographs, no coffee mugs with clever slogans. The absence of personality was itself a kind of statement.
Yuna studied the desk. A faint indentation on the mouse pad suggested years of repetitive motion. The chair was adjusted to a height that indicated a tall, thin occupant. A single sticky note was affixed to the edge of the monitor, blank.
"Where is Kang Min-jun now?"
Hwang checked his watch. "The night shift ended at 7:00 AM. He would have gone home."
"I need his home address."
Director Park crossed her arms. "That information is protected by employee privacy regulations. You will need a warrant."
Yuna felt the familiar frustration of institutional resistance, the friction of wheels designed to turn slowly. She pulled out her phone and stepped away from the group, dialing the precinct sergeant.
"I need a warrant for the home address of a suspect in the Lee Soo-jin case. Name: Kang Min-jun. Employment: Haeju Financial Data Complex, night-shift analyst."
The sergeant sighed. "You're going to need more than a hunch, Yuna. The prosecutor on duty is not going to sign off on a residential warrant based on a coincidental trade."
"Then I need surveillance authorization. I want to know when he leaves his apartment and where he goes."
"That I can do. Give me an hour."
Yuna hung up and turned back to Director Park. "I'll be back with a warrant. In the meantime, I would appreciate it if you did not inform Mr. Kang of my visit."
Director Park's expression remained unreadable. "We have no obligation to assist an investigation without proper authorization."
"I'm not asking for assistance. I'm asking you not to obstruct."
She left the building through the same cavernous lobby, the security guard watching her with the same indifferent gaze. Outside, the gray haze had deepened. A light rain had begun to fall, speckling the pavement with dark spots. Yuna walked to her car and sat behind the wheel, the engine idling, the windshield wipers clearing the rain in slow, hypnotic arcs.
She thought about Kang Min-jun. The name nagged at her, a splinter in her memory. She pulled out her phone and searched the police database, scrolling through old case files until she found what she was looking for.
The file was dated February 2019. Case number 2019-FC-0847. The Haneul Bio fraud investigation. A pharmaceutical company had fabricated clinical trial data, and when the fraud was exposed, the stock had collapsed. The file listed the victims. One of them was Kang Dae-jung, a retired civil engineer who had invested his pension in Haneul Bio and subsequently committed suicide. His son was listed as the next of kin.
The son's name was Kang Min-jun.
Yuna stared at the screen. The connection was tenuous, a thread stretched across five years of silence. But threads could be woven. A man loses his father to a stock manipulation scheme. He disappears into a job that gives him access to market data. Five years later, a woman dies with a stock ticker on her nightstand, and a short position is placed from the man's workstation.
She did not yet know what it meant. But she knew, with the certainty that came from eleven years of following threads into the dark, that Kang Min-jun was not merely a witness to Lee Soo-jin's death. He was connected to it. How, she could not yet say. But the numbers were beginning to speak, and they were telling her a story about grief and mathematics and the terrible things that happened when the two were combined.
She put the car in gear and pulled out of the parking lot. The address the sergeant had sent her was in the old fish market district, a neighborhood of narrow streets and aging buildings that had survived the waves of development that had transformed the rest of the city. She drove through the rain, past the shuttered stalls and the empty loading docks, until she found the building.
It was a five-story walk-up with a convenience store on the ground floor. Yuna parked across the street and cut the engine. The rain fell steadily, drumming on the roof of the car. She watched the entrance to the building and waited.
An hour passed. The street was quiet, the only traffic a delivery truck that rumbled past and disappeared around a corner. Yuna's coffee had gone cold, but she sipped it anyway, her eyes fixed on the building's entrance.
At 4:37 PM, a man emerged.
He was thin, with dark hair cut short and a face that seemed to have been hollowed out from the inside. He wore a gray sweater with a frayed collar and carried no bag, no umbrella, nothing that suggested a destination. He stood in the doorway for a moment, looking up at the sky as if surprised by the rain. Then he began to walk.
Yuna watched him go. He moved with an economy of motion, a precision that reminded her of something she could not name. He did not look back. He did not look around. He simply walked, disappearing into the gray curtain of rain, a ghost in the machine of the city.
She did not follow him. Not yet. She had what she needed: a face to go with the name, a body to go with the numbers. Kang Min-jun existed. He was real. And sooner or later, he would lead her to the truth.
She started the engine and pulled away from the curb, the wipers clearing her view, the street empty behind her. In the rearview mirror, the old fish market district receded into the rain, and somewhere in its narrow streets, Kang Min-jun was walking, not knowing that he had been seen, not knowing that the threads of his carefully constructed solitude were beginning to unravel.
Yuna drove back toward headquarters, the case file open on the passenger seat, the photograph of Lee Soo-jin staring up at the roof of the car. The dead woman's eyes seemed to follow her, asking a question that Yuna could not yet answer.
Who are you, Kang Min-jun? And what have you done?
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