The Bodycam Footage That Arrived at 7 AM

The delivery platform didn't send the original bodycam file until seven in the morning. The file played, but the audio was blank from 03:50 to 04:12. The footage showed Park Hyeonwoo carrying the refrigerated medicine box to the door of the empty house, setting the box down and taking a photo, then stepping back. Only the voice was missing.

The original completion notification was also, in that same window, a preview the app had newly generated. The server event log held two tokens, but the second token's creator appeared only as a hash. There was no way to tell who had canceled it, and Park Hyeonwoo said he had no memory of pressing any button.

Seojin only played the file after comparing the hashes of the original and the copy. Minwoo pulled up the refrigerated zone footage recovered from the warehouse alongside it. The timestamps on the two videos were off by 1.8 seconds. Seojin didn't sync the clocks. She recorded the discrepancy itself.

"The absence of the original audio alone doesn't prove someone deleted it."

"Then just check it with your ability," Minwoo said.

Seojin didn't answer. The blank audio file sounded like nothing at all, but her ability could read the direction of an absence rather than a sound. She might get one word out of it. But there was no way to know whose word it was, or when it had been spoken.

Song Juhyeok passed responsibility for managing the original bodycam audio to the company's security team. The security team's contact said the missing audio was due to the camera's automatic noise reduction feature. Park Hyeonwoo had no memory of anyone asking him to open a door during the delivery. Different people gave different explanations for the same file.

Seojin wrote out the procedure to follow before using her ability: original hash, playback time, observer, expected cost, and an independent verification plan. Minwoo looked at the form and spoke up.

"By the time you finish writing all this, the file could be gone."

"That's why I secured it first."

"It still means the answer comes late."

"If a fast answer turns out wrong, later on you lose the question too."

Seojin listened to the blank audio section again. On screen, there was one moment where Park Hyeonwoo's mouth moved. He turned his head at the door, and his lips shifted briefly. There was no sound. She laid her palm over the file.

The air thinned. The word empty house rose in her mouth before anything else. She couldn't tell whether someone had said it, whether it matched the shape of the mouth on screen, or whether it was a word tangled up in the delivery driver's own memory. Seojin lifted her hand and closed her eyes.

"Empty house."

That single word was all there was. At the same time, an ordinary word slipped out of her head. She reached to point at something on her desk and stopped. The object's name wouldn't come. She knew its shape, it had a handle, it was something you used to hold a hot drink. But it had no name.

Minwoo asked. "What did you lose?"

Seojin started to answer and stopped. Even explaining that she couldn't find the word was hard. She opened her notebook and wrote: ordinary word, hot drink container, currently unrecovered. She couldn't describe the cost of her ability in words, so she recorded what surrounded the description instead.

Yeoreum looked over the record of the ability's use. "Output: empty house. No subject, no tense, no truth value."

"Right."

"So that doesn't mean Song Juhyeok chose the empty house as the crime scene."

"It doesn't."

But Minwoo had already written a question mark next to Song Juhyeok's name. If the word empty house had come out of someone's statement, it was natural to suspect first a connection between the warehouse manager and the delivery address. Seojin didn't erase the question mark. Instead, she wrote a second hypothesis beside it. The delivery driver himself might have said the words empty house, or a word he'd heard in the app's address description might have bled into her sense of it.

Song Juhyeok saw Gray Thread's record and got angry.

"Are you saying I ever chose an empty house?"

"That's not what it means."

"Then why is there a question mark next to my name?"

Minwoo started to answer, but Seojin cut in first. She'd decided not to disclose the results of her ability, but she still had a responsibility to correct the misreading that had already taken hold.

"I heard one word from the file. But who said it, when it was said, and whether it's true, none of that has been confirmed. It can't be used as evidence pointing at Mr. Song Juhyeok."

Song Juhyeok went quiet for a moment. He seemed angrier at the way information with no clear grounding could move people around than at the fact his name had gone onto the case board at all.

"Then take that word out too."

"The fact of the output has to stay. But it goes in the ability record and misreading risk column, not the evidence column."

Seojin read out her own correction. Empty house was not an observed utterance but an ability output, with no confirmed subject, tense, or truth value. The suspicion around Song Juhyeok and the delivery driver would not be sustained on this output alone. As she wrote the sentence, she tried to recall the word she'd lost. The shape of it came back, but not the name.

Park Hyeonwoo watched the bodycam footage again and explained the shape of his mouth at the door. He said he hadn't been trying to look inside the house at that moment, he'd been checking the address plate beside the entrance. He didn't deny the possibility he'd said the words it's empty, but there was no way to know if that had been recorded. The delivery note entered in the app read: at the door if no one's home.

Seojin's word overlapped with the delivery driver's memory, but it still didn't pin down the crime scene. If anything, the possible sources of the word only multiplied.

In the afternoon the team split up to test two hypotheses. First, that someone had used an actual empty house to fake the delivery completion photo and taken the medicine. Second, that the driver had left the medicine at an unattended address and the cancellation token had been generated by an app error. Either hypothesis still had to account for the death at the warehouse and the movement of the medicine box.

Song Juhyeok didn't submit the order management team's original input records. He only said the company's legal team was reviewing them. The silence looked suspicious, but there might genuinely be company data that needed protecting. Seojin wrote: reason for information control needs confirming. It was so she wouldn't turn a person's attitude into evidence of a crime.

Minwoo compared the cancellation token's creation time against the delivery driver's GPS. The token was generated after Park Hyeonwoo had stepped back four paces from the door, and the device's location matched the delivery address. But the platform still hadn't confirmed whether the token creation request had originated directly from Park Hyeonwoo's device.

Seojin wanted to use her ability again. If one more word surfaced, she felt she might learn who had created the token. But the first word had given her no subject and no tense. Repeating the same sensation was more likely to pile up misreadings and lost words than actual information.

She recorded a decision to hold off using the ability. Minwoo read the document and raised an eyebrow.

"So you're not using it this time."

"The first use didn't give enough to go on, and before independent verification, the cost of repeating it outweighs the benefit."

"And we're supposed to just trust your judgment on that?"

"You don't have to. That's why I keep separate records that can be verified."

By night, the platform sent its first reply on the device identifiers. The normal completion token had been issued from Park Hyeonwoo's delivery device, while the cancellation token had been generated through a server relay request. The original source of the relay request was still blank. The blank itself only raised a new question.

Seojin wrote in her notebook the time it took for the lost word to return. The name of the object that held hot drinks still hadn't come back. Minwoo pointed at the object on her desk but deliberately didn't ask about it. He knew that if he said the name for her, there'd be no way to tell whether she'd actually recovered it.

Seojin covered the object with a sheet of paper. It was so the fact that she'd lost a word wouldn't turn into speculation among the investigation team.

In that day's final record, empty house did not go in as the crime scene. It remained as an ability output, and as a misreading risk and a cost. The case board still held only the delivery completion photo, the duplicate token, the body in the refrigerated zone, and the missing bodycam audio.

Before leaving for the day, Song Juhyeok left a single document at Gray Thread. The time the order management team had entered the medicine's delivery address and the name of the person in charge were both blacked out, but the identifier of the input device remained. Seojin didn't relax at the sight of it. If silence didn't mean guilt, handing over a small piece of material didn't mean cooperation either.

She wrote down the document's seal number. The single word gained from her ability had produced the next question, and the single word she'd lost kept her from rushing toward it. Song Juhyeok stayed at Gray Thread even after the document was sealed. He tried not to look at Seojin's notebook, but the fact that she had lost a word had already spread through the team.

"If that word ever points my way, I'll ask for a chance to explain too."

"Of course."

"Though I might choose not to explain."

When Minwoo looked at him, Song Juhyeok took a step back. "Not saying something is different from lying."

"That's true. But if your silence costs someone else something, that cost has to be recorded separately," Seojin answered.

Song Juhyeok thought for a moment, then said the order management team's input device was linked to his own approval account. Instead of releasing the name of the person in charge, he left a document taking responsibility for the approval time himself. Whether this was hiding someone or protecting someone still couldn't be determined. Seojin set that distinction aside as a question for the next round.

At eleven that night, the lost word partly returned. Seojin recalled the name of the object on her desk, but she recorded only the recovery time and didn't write down the fact as relief. Instead of giving answers, the ability had shaken the sentences people spoke, and that shaking had to stay in the record. Seojin didn't say the recovered word out loud right away. She marked a small dot beside the blank in her notebook. The cost of the ability demanded its own time and order even in the moment of return after disappearing. That one dot became a line to hold before the next verification. Minwoo saw the dot and didn't ask what it meant. Instead, he resent the request for the two tokens' original data to the platform. Until an answer came, the blank on the case board had to stay blank.