The Missing Word

Baek Sangho walked into the management office carrying a wrench.

The work order marked "routine replacement" had been printed after the incident. The ink on the paper was fresh, and the wheels on the server rack still had dust from the basement floor clinging to them.

"You can't move the equipment." Minwoo blocked the doorway.

"I have a safety inspection contract. It has the building owner's signature."

The document Baek Sangho held out bore the building owner's corporate seal. On paper alone, he had the authority to move the server. Seojin looked at the seal, but she looked first at the gap between the wheels under the server rack. It was the same width as the impression she'd photographed the day before.

"Whether the contract is genuine and whether this equipment can be moved right now are two different questions." Yeoreum said.

"Then the power gets cut. Remote backup goes down too."

"Power stays on." Minwoo said, photographing the scene. "We'll seal the device serial numbers and file a request against any changes."

Baek Sangho didn't set the wrench down.

"Can you tie up a server without a warrant?"

"We're not seizing the whole thing. We're requesting that its current state not be altered."

"And if the company refuses?"

"We'll record the refusal too."

Minwoo read out the serial numbers of the three devices. Seojin wrote down who was responsible next to each number. Minwoo photographed the scene, Dohyun confirmed the power indicators, and Yeoreum explained the scope of preservation to the building owner again.

Han Gyeongmin called the building owner from inside the management office. He kept a formal tone at first, but on the second call he said, "Please cancel it now." The voice on the other end wasn't audible, but Seojin saw Gyeongmin's shoulders drop.

"The owner has withdrawn consent for the replacement." Gyeongmin said. "But he says remote maintenance authority still belongs to the company."

Baek Sangho's face hardened.

"Remote authority belongs to my company under the contract."

"That's exactly why those logs need to be preserved." Yeoreum said.

"The remote logs belong to the cloud provider."

"Then we'll freeze not the whole server, just the access and change events around the time of the incident."

"Without a customer number, we can't define the scope."

Seojin opened the photo of the receipt she'd found in the recycling bin. Four digits of a customer number remained under the blue triangle. It was a number that could narrow down the account in question without disclosing the whole receipt.

"Let's preserve just the device serial numbers, part of the customer number, the 24 hours around 5 a.m., and the type of change events for now."

Yeoreum looked at Seojin.

"What about viewing the content?"

"We separate preservation from viewing."

"That narrows down who could have done the deleting, but it pushes back the question of what was deleted."

"If we pull the original text now, it could bring in information about the person Davin was protecting."

Yeoreum started to correct Seojin's sentence, then stopped. Instead, she quoted it exactly.

"Pulling the original text could mix in information about a protected party."

Seojin noticed that Yeoreum hadn't corrected her wording. That small pause felt like a sign of trust, but she didn't write it down in the feelings column.

At 1:10 p.m., the cloud provider accepted the preservation request. The content itself would not be frozen; only access times, IP addresses, customer numbers, and change events would be preserved. Gray Thread hadn't gotten everything. But it had managed to block the deletion without forcing through an original text that would mix in information about the parties involved.

Then the provider's representative spoke.

"Among the remote logs, the session expiration record gets auto deleted after 24 hours."

"When exactly?" Minwoo asked.

"Tomorrow at noon."

Minwoo checked the time. Less than 23 hours remained.

Baek Sangho's laptop chimed briefly. A small notification appeared at the top of the screen.

'Session auto delete 23:58:41.'

Seojin saw the notification, but she didn't photograph the screen. Baek Sangho's laptop was a personal device, and the notification alone couldn't go into the investigation record.

"Who opened the remote session?"

"The account owner is the head office." Baek Sangho said.

"And the user?"

"I don't know."

He separated the account from the user. Technically, that could be true.

Seojin turned to Han Gyeongmin.

"Can you submit the original receipt?"

Gyeongmin didn't refuse right away.

"I've never seen that piece of paper."

"I'm asking whether you can submit it."

"It came out of the management office recycling bin. It might have residents' personal information on it."

"Then we can hand it to a third party custodian. You'd only keep it, and Gray Thread wouldn't open the envelope."

Gyeongmin looked at the photo of the receipt. The fact that the numbers under the blue triangle came from his own management office pushed him back into the position of responsibility.

"I don't have the original."

"Then just confirm the location and time it was found."

"6:08 a.m., in the recycling bin next to the server. I saw it myself. I didn't touch it."

Minwoo asked.

"Why didn't you say so right away, then?"

Gyeongmin didn't answer. Yeoreum didn't ask again. She waited.

"I was afraid the blue mark would get linked to the company." Gyeongmin said. "If it did, the building's illegal subcontracting would come out too."

"Did you think that illegal subcontracting was connected to Han Jaehee's death?"

"I don't know. But I hid it even not knowing."

Seojin wrote the sentence down exactly as he said it. Hiding something without knowing and hiding it while knowing were different things, but either one could leave someone else worse off.

At 3 p.m., the original receipt turned up in the management office's waste storage. Gyeongmin agreed to send the sealed envelope to a third party custodian. Seojin photographed the fold direction and the thermal print marks without touching the receipt.

The paper appeared to have been printed at 10:48 p.m. the previous night. The impression on the bottom of the receipt had the same spacing as the corner of the server rack's base case. It didn't mean they were the same object. It meant there was now one more possibility that the receipt had been placed near the server equipment.

Beneath the blue triangle, a faint number, "17," was visible. Seojin didn't zoom in on the number. The thought that it might connect to the 17 seconds from her brother's case came to her first, but that was her own memory, not physical evidence.

"Aren't you going to look?" Minwoo asked.

"We only preserve it. Interpretation has to wait and match up with the next record."

Yeoreum signed the seal tag, and Gyeongmin wrote his name as the custodian. Minwoo confirmed that the scene's condition had not been altered.

At 6 p.m., the server rack remained in place. But the clock on the remote logs was still running down. Gray Thread hadn't managed to seize the equipment, and it hadn't gotten to view all the customer information either.

Instead, after deciding what not to look at, it had fixed in place what must not be allowed to disappear.

Seojin wrote the seal number of the blue triangle receipt envelope in her notebook. The number 17 was still a question. This time, it was the impression left under the server rack, more than her brother's missing piece, that held onto that question first.

At 8 p.m., Baek Sangho came back to the management office. This time he carried a laptop instead of a wrench.

"I'm here to close the remote maintenance session."

Minwoo stood in the doorway.

"If you close the session, does the log disappear?"

"The log stays on the cloud. But if the session stays open, the auto delete time might get renewed."

Yeoreum spoke without looking at the laptop.

"That action conflicts with the preservation request. Tell us first what change it would cause."

"Then the server becomes unstable."

"We need grounds for that claim of instability."

Baek Sangho started to cite a part number, then stopped. Seojin realized he was trying to push back the question with technical explanation, but the strategy itself wasn't evidence of a crime.

"Can you check the status without closing the session?" Seojin asked.

"That's possible."

"Can you check only the change events the system logs, without looking at the work screen?"

Baek Sangho looked at her.

"There's nothing I can fix this way."

"We're not fixing anything right now. We're preserving who was trying to change what."

In the end, he set the laptop on the table. He didn't open the screen; only the connection cable got sealed. Seojin photographed the label on the end of the cable. The label had a device number that differed from the server rack number.

Dohyun spoke.

"This cable isn't for remote console use, it's for on site diagnostics."

"So it can access the server directly?" Minwoo asked.

"It can access it, but this cable alone doesn't tell us who connected it just now."

Seojin recorded where gray dust and blue paint powder had gotten onto the contact surface of the cable. It might connect to the impression under the rack, but it could also be equipment that had traveled through multiple sites.

"We'll send this to the custodian too."

Han Gyeongmin objected.

"If you keep handing off equipment, nothing's left in the management office."

"What needs to stay isn't the equipment, it's the unaltered state." Yeoreum said.

Gyeongmin looked at Yeoreum.

"I understand that, but if we can't confirm anything later, who takes responsibility?"

"I'll record the responsibility for the decision to narrow the scope."

Listening to that, Seojin wrote next to Yeoreum's name: "decision to preserve minimum scope." Yeoreum saw the note and didn't tell her to erase it.

At 11:58 p.m., the first preservation confirmation arrived from the cloud provider. It stated that the change events linked to part of the customer number and the device serial numbers had been frozen. The original content still could not be opened.

Minwoo read the screen.

"There's one deletion session. The account belongs to head office, the access IP is on the subcontractor's network."

"Has the user been confirmed?"

"No."

Seojin laid the photo of the receipt's impression side by side with the device number from the log. The two weren't one chain yet. But the receipt's standing had changed, from trash left after the incident to an object that might have traveled with the equipment the night before.

Baek Sangho asked from the doorway.

"Are you writing this down as me cooperating?"

"We don't write down an evaluation like cooperation."

"Then what do you write down?"

"The fact that you brought the laptop, that we checked the cable's condition, and that you requested a change to the remote session."

He looked at Seojin for a long moment.

"A person is more complicated than a machine."

"That's exactly why we keep a person's choices separate from the logs when we record them."

Baek Sangho didn't answer. He sealed the laptop. Before leaving, he turned to look back at the server rack once. Minwoo was the one who saw that look, but no one wrote down the meaning of that look as fact.

The auto delete deadline was noon the next day. The server remained in place, and part of the remote log had been frozen too. But records outside the restricted scope could still be deleted.

Seojin wrote a new question on the gray chart. Not the account of the deleted session, but who had tried to leave behind only a certain scope before the deletion happened.