The rain had stopped by morning.
The city looked cleaner than it deserved to.
Seo Hae-in arrived at the office before eight.
She placed her bag beneath the desk and opened the blinds halfway.
Not completely.
She preferred the room without too much sunlight.
Kang was already there.
He was sitting at the conference table with two cups of coffee.
Hae-in looked at them.
"You're early."
"So are you."
"That's different."
"How?"
"I don't know."
Kang pushed one of the cups toward her.
"Then don't explain it."
She picked it up.
It was warm.
She took one sip.
Too sweet.
She looked at him.
"You put sugar in this."
"Two."
"I don't take sugar."
"You did yesterday."
She paused.
"I did?"
"You complained about it being bitter."
Hae-in stared at him.
Then took another sip.
"I don't remember that."
Kang smiled.
"That's because you were busy reading."
She didn't answer.
But she finished the coffee.
The case board had changed overnight.
Not physically.
Hae-in had simply moved three photographs.
The detention center.
The maintenance report.
The missing second man.
They were no longer arranged in a straight line.
Instead, she had placed them beneath one question.
WHO HAD ACCESS?
Kang stood beside her.
"The maintenance worker list came back."
"How many?"
"Seven people had authorized access to that section during the relevant week."
"Seven."
"Six have been accounted for."
She looked at him.
"And the seventh?"
"Dead."
Hae-in's expression barely changed.
"When?"
"Three months ago."
"Cause?"
"Heart attack."
She looked back at the photographs.
"Convenient."
Kang shook his head.
"Don't do that."
"Do what?"
"Assume every death is part of the conspiracy."
"I'm not."
"You just called it convenient."
"Convenient isn't the same as suspicious."
He considered that.
"Fair."
She reached for the personnel file.
The man's name was printed across the top.
HAN DONG-WOOK.
Age sixty-three.
Former maintenance supervisor.
Twenty-nine years of service.
No disciplinary history.
No suspicious financial activity.
No known criminal associations.
Hae-in read the page twice.
Then stopped.
"What?"
Kang noticed.
She pointed at the employment history.
"Look at his last assignment."
He leaned closer.
"Detention Center C."
"Before that."
"Central District Courthouse."
"How long?"
"Four years."
Hae-in looked at him.
"That's where the original hearing was held."
Kang's expression hardened.
"You're thinking he knew about the case."
"Maybe."
"That's a big maybe."
"I know."
She turned the page.
A small note had been attached to the back.
PROPERTY RETURNED TO FAMILY — PENDING
Kang frowned.
"What property?"
"No idea."
They searched the records.
Nothing.
The prison had no detailed inventory.
The courthouse had no record.
Han's family had apparently collected his personal belongings after his death.
Except for one item.
A maintenance receipt.
Hae-in stared at it.
It was ordinary.
Paper.
Folded once.
Stamped with a date.
She read the description.
Replacement lock cylinder — Service Door C-17.
Kang looked at the door number.
"C-17."
"The same block."
"Maybe that's normal."
"It could be."
She turned the receipt over.
There was handwriting on the back.
Three numbers.
17 — 04 — 92
Kang frowned.
"A date?"
"Maybe."
"April seventeenth, 1992?"
"Could be."
"But that's decades ago."
Hae-in placed the receipt beside the photograph of the detention center.
"Then we find out what happened on that date."
The archive room smelled of paper and dust.
Kang searched the digital database.
Hae-in searched the physical records.
She had learned something about old institutions.
The information they wanted was rarely missing.
It was simply buried beneath years of paperwork.
After forty minutes, Kang called her.
"Found something."
She walked over.
He turned his monitor toward her.
"There was an incident report from 1992."
"What happened?"
"Nothing major."
She looked at him.
"Then why is there a report?"
"Because someone complained."
He opened it.
A young detainee had reported that another prisoner had been taken from his cell during the night.
No transfer order.
No medical request.
No disciplinary record.
Just...
gone.
Hae-in read the final line.
Matter resolved internally. No further action required.
Her eyes stayed on the screen.
"When was the detainee released?"
Kang checked.
"Never."
She looked at him.
"What?"
"His sentence was twenty years."
He scrolled.
"He died inside the facility in 1998."
The room became quiet.
Hae-in looked at the date on the receipt again.
17 — 04 — 92.
The same date.
Kang noticed it too.
"That's not coincidence."
"No."
"What happened to the missing prisoner?"
"There is no record."
"Name?"
Kang searched.
Then stopped.
His expression changed.
"What?"
He slowly turned the monitor.
The missing prisoner's name was listed.
LEE JI-HOON.
Hae-in stared at it.
She knew that name.
Not from the case.
From somewhere else.
She searched her memory.
Then remembered.
"The second man's statement."
Kang's eyes widened.
"He mentioned that name."
Hae-in nodded.
"Once."
Neither spoke.
The name had been buried in a witness statement three weeks earlier.
They had dismissed it as an old acquaintance.
Now it sat between them.
Thirty-four years old.
Still connected to the present.
Kang closed the file.
"So the organization has been operating for at least thirty-four years."
Hae-in shook her head.
"No."
He looked at her.
"We don't know that yet."
She tapped the receipt.
"We know someone wanted us to notice the date."
"Why?"
"That's what we need to find out."
That afternoon, Hae-in visited the courthouse archive alone.
The clerk recognized her.
"Looking for something specific?"
"Old hearing records."
"How old?"
"1992."
The clerk's smile disappeared.
"That's very old."
"I know."
After twenty minutes, a box was placed on the counter.
Hae-in opened it.
Dust rose from the pages.
She turned them carefully.
Case numbers.
Names.
Appeals.
Transfers.
Then she found it.
A juvenile case.
LEE JI-HOON.
But the record was incomplete.
The final page had been removed.
Hae-in stared at the torn edge.
Someone hadn't lost the page.
Someone had taken it.
She photographed the remaining documents.
Then closed the box.
As she turned away, the clerk spoke.
"Detective?"
Hae-in stopped.
"There was another box."
She looked back.
"What box?"
"The one before yours."
"What happened to it?"
The clerk hesitated.
"Someone requested it yesterday."
"Who?"
"I don't remember."
Hae-in waited.
The clerk swallowed.
"But I remember what they asked for."
"What?"
"Everything concerning Lee Ji-hoon."
Hae-in's hand tightened around her phone.
"Did you see their face?"
"No."
"Anything else?"
The clerk thought.
Then nodded.
"They paid the archive fee in cash."
"How much?"
"Exactly one thousand won."
Hae-in looked at him.
"Anything unusual about that?"
The clerk shook his head.
"No."
She thanked him and walked outside.
Her phone vibrated.
A message from Kang.
We found something else.
A photograph followed.
Hae-in opened it.
It was an old photograph from the detention center.
A group of maintenance workers stood outside the facility.
Han Dong-wook was among them.
But that wasn't what caught her attention.
At the edge of the photograph stood a much younger man.
His face was partially turned away.
Kang had circled him.
Underneath the photograph was one sentence.
He appears in three different personnel photographs over twenty years.
Hae-in stared at the image.
The man hadn't aged.
Not noticeably.
Not even by twenty years.
Her first instinct was to call Kang.
Instead, she zoomed in.
The man's face became clearer.
Then her phone rang.
Unknown number.
She answered.
No greeting.
The same breathing.
The same silence.
Then the distorted voice.
"You keep looking backward."
Hae-in stood still.
"Because someone keeps leaving things behind."
A pause.
"You're getting closer."
"To what?"
The voice softened.
"To the reason your case was never supposed to survive."
The call ended.
Hae-in lowered the phone.
For the first time that day...
she looked afraid.
Not because of the threat.
Because she understood something.
They weren't trying to stop her anymore.
They were guiding her.
And that meant the next clue was probably waiting for her.
Somewhere they wanted her to look.
She turned toward the courthouse.
Then toward the city beyond it.
And started walking.