The Traitor's Voice

The waveform's beginning and end were empty. More precisely, they looked empty. When Minchae zoomed in on the screen, the black line wasn't complete silence but a low hum of noise laid underneath. It was a thin trace, impossible to tell whether someone had deliberately erased it, the equipment had failed to pick it up, or it had been cut off during transmission.

The speaker didn't play it again. Jang Yura raised her hand to stop it.

"No repeat playback. Front and back first."

She didn't look at me. Probably because my expression alone would have told her the conclusion. The moment I heard Yun Seora's voice, I remembered the smell in front of the south gate sluice. Wet concrete, a hot motor, the sound of water that seemed louder without an alarm. And the same sentence.

Open the south gate.

Memory wasn't evidence. I couldn't count how many times I'd written that down over the past few days. But when the same voice came through, my hand moved first, not to column X in my notebook, but to column A. Even when I didn't want to, my body trusted an old certainty.

Seojin read out the file properties. "Original length twenty three seconds. The actual voice segment is two point four seconds. There are levels at the front nine minutes thirty one seconds and the back nine minutes twenty nine seconds, but the data tags are empty."

"That adds up to nineteen minutes," Minchae said.

Im Doyun wrote it down immediately. "Nineteen minute gap. Do not assume deletion."

"If it's not deletion, then what," I asked.

He looked my way. "Equipment failure, proxy authorization, transmission failure, unsupported format. Right now those are candidates."

I didn't answer. The word candidate was too slow. The city was closing down, the sluice reservation had been moved up, and Yun Seora's voice had told someone to open the south gate. Slow words could get people killed. But fast certainty had killed people too. My notebook was proof of that.

The terminal blinked once. A new connection request appeared over a window with no sender listed. `YS-AUTH / LOW BANDWIDTH`. Jang Yura lowered the speaker volume and said:

"Record it. Preserve the original."

Seojin nodded. "It's on."

When the connection opened, Yun Seora's voice came through again. This time it was live. There was a lot of noise, and it cut out every couple of words.

"That file... did you save the original hash first?"

I didn't smile. "That's your opening line?"

"I figured you'd be angry. Still, the hash first."

A fragment of casual speech slipped through the static. It was short, like a leftover trace of an old relationship. She switched back to formal speech right away. "That voice is mine. But the original order wasn't to open the south main sluice."

"That sentence is right there in the recording."

"It's a section about opening a model valve during an emergency patch procedure. The site name may have been shortened to 'south gate.' If you hear it without the original context, it sounds that way."

"How convenient."

"It's not convenient. That's exactly why I'm telling you to look at the nineteen minutes before and after."

Jang Yura cut in. "Don't tell us to trust you. Give us something we can verify."

Yun Seora answered right away. "In the detailed log view, two fields below the executor. There should be a proxy token field after executor. If it doesn't show, switch to raw view. Check whether `LCHS-DELTA` or an empty token remains there."

Minchae raised her hand and then moved it straight to the keyboard. "Raw view... I don't have permission."

"Viewing the offline cache is fine. Don't go through the network. If you connect now, your location will be logged in the central queue."

"How do you know that," Im Doyun asked.

"Because I designed it."

It was a short answer. Worse than an excuse. A designer stays responsible even if innocent. Yun Seora wasn't dodging that fact. But admitting responsibility and denying the crime could both be true at the same time. That made it harder to judge.

Minchae opened the local cache. She didn't hack anything. She pulled up a read only copy of the log that the Boridong terminal had already received. One more field appeared on the right side of the screen.

executor: YS-AUTH

proxy_token: LCHS-DELTA-EMPTY

generated_at: 02:17

applied_at: 02:36

Minchae's hand stopped. "There's a nineteen minute gap between generation and application."

Seojin asked right away. "Is there a record of what happened during those nineteen minutes?"

"It's empty," Minchae said. "No, wait, the field exists, but there's no record."

O Gyeongtae's voice cut in over the hospital intercom. "When equipment dies, you get fields like that. Don't assume it's all deletion."

Seojin argued the opposite. "You get fields like that even when something is deleted. Especially when only the original index survives."

I looked at `YS-AUTH` on the screen. It was too close to say it wasn't Yun Seora, and there was one more field to say for certain that it was. Proxy token. Delegated execution. That field didn't exist in my memory of the future. Or maybe I just hadn't seen it, or couldn't remember it. Traumatic memory fuses scenes together all at once. It compresses silence, command, and collapse into a single frame.

"You opened the south gate," I said.

On the other end of the line, her breathing stopped for a moment. "I know that's how you remember it."

"I never said I remembered it that way."

"I know that's how you see me."

Jang Yura said quietly, "Personal feelings between you two, set them aside for now."

Yun Seora corrected herself right away. "I'll only say what can be verified. My voice is mine. My authorization signature is mine too. But the execution went through a proxy token, and the nineteen minute window is empty. I don't have any material to explain that gap."

"What about your location," Im Doyun asked.

"I can't disclose that."

"Then that's not cooperation."

"If I disclose it, your location gets caught along with it. Keep the Boridong cell terminal offline for now."

Seojin asked sharply. "How do we tell whether you're protecting us or hiding your own trail?"

"I can't tell either," Yun Seora said. "That's why I told you to preserve the original."

The control room went quiet at that. It wasn't a perfect explanation. If anything, there were more gaps than answers. But someone who only lied usually wouldn't be the first to bring up a preservation procedure that worked against them. Of course, even that could be calculated. Yun Seora was capable enough for that.

Im Doyun stepped closer to the comm line. "Ms. Yun, your current statement mixes self defense with technical cooperation. If this is going to be used as a legal statement later, they need to be separated."

"I know."

"Then separate them now. Confirmed facts."

Yun Seora didn't answer right away. Something like the sound of typing came through the static. "First, the voice is mine. Second, that file is not the full original. Third, if there's a proxy token field, the party who executed it might not be my account alone. Fourth, I am not currently connected to the Boridong terminal."

"Unverifiable or unconfirmed."

"My location. The cause of the nineteen minute gap. Whoever created the proxy token. And whether the south gate scene Han Igyeom remembers is the same incident as this file."

When my name came up, my throat felt dry. She didn't deny my memory. At the same time, she also stopped that memory from becoming the verdict on this file.

Seojin asked. "What's against you here?"

"That my authorization design made proxy execution possible in the first place. No matter who pressed it, my responsibility doesn't disappear."

That didn't sound like an apology. It was closer to a report sentence. But it was very much like Yun Seora. Not trying to be forgiven by putting feeling into it. That made it colder, and that made it a little harder to trust.

Minchae pointed at the bottom of the screen. "There's a checksum in the token details. But one character is corrupted."

"Don't read it," Yun Seora said urgently. "Don't try to guess the corrupted character. If auto correction turns on, the central queue sends a request for the original."

Minchae pulled her hand back. "I didn't press anything."

"Good. Right now, one more unknown character is safer."

O Gyeongtae grumbled over the intercom. "Why do machines these days keep trying to fill in what they don't know. If you don't know, leave it blank."

Seojin wrote that down. "Keep it blank. Can't air this on a broadcast, but it goes in the record."

I looked at the waveform again. The two point four second voice was too clear, and the nineteen minutes before and after were too blurred. If I cling only to what's clear, Yun Seora becomes the culprit. If I cling only to what's blurred, no one takes responsibility. Both could be wrong.

"Seora," I said.

The other end of the line went quiet for a moment.

"Is there more you're not saying?"

"There is."

Jang Yura narrowed her eyes. "Then this isn't cooperation."

"If I say it now, you'll make a choice you shouldn't be able to make. That's why I'm not saying it."

"That judgment is control too," Jang Yura said.

"That's right." Yun Seora's voice dropped lower. "So don't trust me. Look at the logs instead."

Cooperation that told you not to trust it. That was all Yun Seora could give right now. I couldn't say I liked that. But not liking it didn't mean I could throw it away.

The time in the upper right corner of the terminal flickered. The network time, which had been showing 08:??, jumped back to 02:17 and then returned. Minchae held up an offline clock.

"Real time is 09:18. Only the network time is glitching."

Yun Seora's voice grew urgent. "Check the cell command queue. A sluice reservation is coming in. Not on the D-day baseline, on the current queue."

"What sluice," Jang Yura asked.

"The outer sluice southwest of Boridong. It's attached to the auxiliary line of the west sea barrier. If that closes, Cell 3 will have to circulate its own water."

I looked for the dotted line on the map. The line O Gyeongtae had marked as a possibility back in chapter 15. The line he'd noted as unconfirmed pending a check of the blueprints. A possibility had become a command queue in less than a day.

Minchae opened the cell terminal. The reservation command list had originally been hidden in the admin screen, but now part of it was showing under the cell autonomous operation tab. One line blinked white.

BORI-GATE-SW3 / CLOSE / 02:17 SYNC / D-11 OVERRIDE.

The authorization account was not Yun Seora's.

LACHESIS-FUTURE-CODE / 7C-PRESERVE.

Im Doyun silently photographed the screen. Instead of writing the same sentence twice, Seojin only noted the account name and the reservation time. Jang Yura radioed out immediately.

"Confirming a closure reservation for the southwest outer sluice. Field team, keep people away from the area. Chief O, can you do a manual check?"

O Gyeongtae coughed. "I can't see that sluice directly. But pressure's going to spike before it closes. Don't open the water supply valves any further, and stop water use on the upper floors."

Mun Sangpil, who must have heard from outside the control room door, muttered a curse under his breath. "Good thing we didn't run more of it earlier."

I looked for the D-day line in my notebook. The sluice closure had originally been eleven days away. I moved to draw a line through it, then stopped. It wasn't an X yet. There wasn't enough physical fact to declare it completely wrong. But by working standards, it could no longer be trusted. I downgraded B to C, and wrote beside it: "Current queue takes priority. Date pending."

Seeing that notation, Minchae asked. "Pending, does that mean you believe it or not?"

"I don't trust it as a basis for rescue plans, but I keep it as evidence."

"That's confusing."

"Same here."

Seojin wrote that exchange down exactly as it was. "Log the confused state too. So no one can cut it later and claim they were certain."

Jang Yura put red tape on the sluice map. "Then our current standard is to prepare as if it's closing. Report the cause as unknown, and don't speak on it."

The words were short, but they held this chapter's answer. Leave the doubt in place, and don't slow down the action. Im Doyun marked that sentence separately. "Separate the standard for action from the conclusion of the investigation. This is going to matter later."

"Han Igyeom," Jang Yura called.

I looked up.

"Save the doubt for later. Right now, it's the closing gate first."

She was right. Whether Yun Seora was a traitor or not wouldn't raise the water in the cell right now. The meaning of the nineteen minute gap wasn't an answer right now either, just a danger range. We had to prepare for the closing sluice before we solved the mystery.

Yun Seora spoke one last time. "Don't erase the proxy token. And don't make the nineteen minutes into the culprit either. Someone might have stopped it during that time."

"Who."

Before the connection cut out, her voice came through once more. "I still don't know that."

The terminal went silent. Instead, the reservation line grew bolder.

BORI-GATE-SW3 closure scheduled: at 02:17 sync.

Eleven days earlier than D-day on the calendar.