Two Cases in the Same Vault

There were two identical cases in the shared sealed storage vault.

Their exteriors and serial number sleeves matched, but the wear pattern on the wheels didn't. Minwoo stuck a notice next to his watch, a reminder that surface sampling would begin in fifty minutes.

"The sleeve can be swapped."

"That's why we look at the wheels and the handle," Dohyeon said.

Han Yeoreum spread out the court order. External surface sampling was limited to the original case. They had to determine which one was the original first.

Seojin compared the centers of gravity of the two cases. Case A was heavier at the bottom right, Case B was heavier toward the left handle. Even without opening them, she could tell the internal equipment layout differed.

"Which one is the original case?" Minwoo asked.

"Weight alone won't tell us. We need to check the wheel tracks and handle scratches against the photos taken in front of the server rack."

Baek Sangho entered the vault with two company employees.

"Both cases are company assets. If you designate one as the original, you risk mishandling another client's data."

"That's why we're photographing the exterior condition of both cases," Yeoreum said.

"Only one can be sampled."

Minwoo checked the seal numbers. Fresh adhesive was visible on the sleeve's bonding surface. There was now a possibility that the numbers on A and B had been swapped.

Seojin looked inside the handle. A scrap of blue thermal paper was wedged in the rubber seam of Case B. It looked like the same material as a receipt, but she didn't pull it out by hand.

"This needs to be preserved first."

"That's just a scrap of paper," Baek Sangho said.

"That's exactly why the collection point gets logged separately."

Minwoo read off the list of people who had known the on site plan. Himself, Yeoreum, Dohyeon, Baek Sangho, the company's legal team. And Seojin.

His finger stopped at Seojin's name.

"Is there a chance the company knew this plan in advance?"

"I didn't share it."

"Neither did I," Yeoreum said.

Baek Sangho said nothing. He was looking at Case B.

At 11 p.m., Baek Sangho's continuous statement began in the vault office. After confirming the connection status of the raw audio equipment and the attendees, Seojin sat at the back. She still held analysis rights, but the authority to draw conclusions on her own had already been restricted on the gray sheet.

"Are both cases company equipment?"

Minwoo asked.

"Yes."

"Did you ever order a swap after the incident?"

"No."

"What about returning one?"

At that word, Baek Sangho tapped the chair twice with his finger.

Inside Seojin's ear, a single word dropped free.

"Return."

It was a word that had never left Baek Sangho's mouth.

Seojin wrote the extracted word in her notebook. But the ordinary word she meant to write beneath it disappeared. She couldn't recall the name of the thing you kept paper in.

"That thing..."

She pointed at the notebook with her finger. The word "envelope" wouldn't come.

Minwoo looked at her. Yeoreum noticed too.

"Analyst, can you continue with the questioning right now?"

Seojin didn't answer. Without reporting her second use of the ability to the team, she was already steering the statement in a new direction.

Minwoo asked Baek Sangho.

"Return it to whom?"

Baek Sangho looked up.

"I never said any such thing."

"That's exactly what I just heard."

Seojin said. The moment she said it, the air in the room went still.

Yeoreum stopped the statement at once.

"That statement just now isn't evidence. And the analyst is removed from interpretation rights on this statement."

Minwoo protested.

"If we stop now, we lose sampling time."

"Losing time and breaking the rules are two different things."

"We can discuss discipline after the case is closed."

"No. Her analysis rights need to be suspended now. Once an extraction enters the record, no one will be able to verify how it got there later."

Seojin looked at Yeoreum.

"If you exclude me, we can't compare the cases."

"You can still provide observation notes. I'll handle conclusion approval and final identification, and Han Gyeongmin will do the independent check."

Han Gyeongmin pointed at himself, startled.

"Me?"

"You held the original and you're a party to the case. That's why you need to confirm it alongside another reviewer."

Gyeongmin looked at the two cases. He didn't try to fill Seojin's shoes by acting more capable than he was.

"I once repaired the handle on Case B. The case our building used is this one."

He was pointing at A.

Baek Sangho objected immediately.

"Both cases are shared equipment."

"Shared, but I replaced the right wheel axle on A myself."

Gyeongmin described the marks left on the exterior. The numbers and the timing were precise, but he didn't ask anyone to open the envelope. He was careful not to inflate his own memory into evidence.

Seojin stepped outside the perimeter line. Yeoreum opened a new field on the gray sheet.

Analysis rights suspended. Extracted word: return. Lost word: envelope. Time of use: 23:04. Independent reviewers: Han Yeoreum, Han Gyeongmin.

Seojin wrote the last line herself.

"Ability output is not grounds for case identification."

Minwoo was still rushing to get to the surface sampling. Yeoreum held the line on the scope of the order while keeping the analysis rights suspended. The friction between them had stopped being about closeness and had turned into a question of who would carry which risk.

At 23:12, eighteen minutes remained before the court order took effect. Baek Sangho was on the phone with the legal team, negotiating terms for recovering the case. Whether he was buying time or protecting company data still couldn't be determined.

Han Gyeongmin looked at the wheel axle on Case A and spoke.

"This was fixed in our building."

Unable to find the word for envelope, Seojin pressed her finger against the corner of the notebook. The lost word was gone, but this time the blank stayed inside the team's record.

Minwoo didn't cross Seojin's name off the site plan. Instead, he wrote beside it, "provides observation data, excluded from conclusion approval."

"We'll proceed with surface sampling under these conditions."

Seojin nodded from outside the perimeter line. Not being allowed to touch anything directly felt like being pushed out of the case, but she didn't let that feeling become grounds for judgment.

Yeoreum had the two men read out the serial numbers on Case A and Case B separately. Minwoo checked the exterior sleeves, and Han Gyeongmin checked the repair marks on the wheel axles and handles. A point emerged where the two men looked at the same object and gave different accounts.

"The right axle on A has been replaced once," Gyeongmin said.

"B has a similar mark," Minwoo answered.

"But B's mark is fresh. The metal color is different."

Yeoreum logged the difference along with photographs. Without yet settling on which was the original case, she distinguished A as having an old axle repair and B as having a recent mark.

Baek Sangho came back from his call.

"The company wants both cases recovered. They say leaving just one behind would create liability for client data management."

"The court order is for preserving the condition of the original case," Yeoreum said.

"But we don't even know which one is the original, do we?"

"That's why we're recording the condition of both and having the identification result independently reviewed."

"And if the surface gets contaminated in the meantime?"

"We log who accessed it and when."

Baek Sangho took off his gloves without a word. There was black grease on his fingertips. Seojin saw it, but today she didn't interpret the substance on his hand. She only passed it to Yeoreum as observation data.

At 23:26, surface sampling began. Dohyeon collected the scrap of blue thermal paper from inside Case A's handle, and from Case B collected only fluorescent particles. The location and orientation were each noted on the collection envelopes.

Seojin compared photographs from outside the perimeter line. Inside A's handle there was a direction of pressure and a fold mark on the paper. Confirming whether it matched the material of a receipt would require microscopic analysis. She didn't state a conclusion.

Han Gyeongmin looked at Case A's wheels and spoke.

"This is a mark from where it once caught on the threshold in the basement of the management office."

"Is that memory or record?" Yeoreum asked.

"Memory. That's why it needs confirming."

Gyeongmin lowered the weight of his own testimony on purpose. Seojin didn't record that as evidence of trustworthiness, but as a limit on the statement.

Minwoo came over to Seojin.

"If you heard "return," does that mean Baek Sangho meant to hand the case back to the company?"

"I don't know. I only heard the word."

"Then we can't connect it to the case in front of us?"

"It can generate a question. It can't generate evidence."

Minwoo let out a sigh.

"This time, I'll take your word for it."

Hearing that didn't bring Seojin any relief. Trust shouldn't mean the extraction was correct, it should mean leaving room for her to be wrong.

At 23:42, surface sampling ended. There was now a possibility that the blue paper scrap from Case A and the thermal layer of the receipt belonged to the same family, but the source wasn't confirmed. The fluorescent particles from Case B fell within a range that could have transferred from an earlier scene.

Han Yeoreum added both results to the preservation list separately.

"A: paper scrap, contact surface, axle repair. B: fluorescent particles, recent mark. Neither is evidence that Baek Sangho committed murder."

Minwoo said.

"But the possibility remains that someone tried to swap the cases."

"The possibility stays, but we don't write it down as an attempted swap."

Seojin checked the hypothesis field on the gray sheet. Next to the line "attempted to alter surface sampling by substituting a case," a set of disproof conditions had been added. The two cases' entry times, the seal sleeve replacement record, the vault's CCTV footage.

Han Gyeongmin looked at Baek Sangho one last time.

"Why weren't you fazed at all when you heard the word return?"

Baek Sangho's face hardened.

"I never said that word."

"Seojin said she heard it."

"Her senses aren't evidence, are they."

That much was true. At the same time, he knew the scope of Seojin's ability. The possibility that internal team information had leaked to the company rose again.

Instead of questioning Baek Sangho further, Yeoreum requested the access log of the company employees who had entered the vault. She wanted to confirm where the leak had come from using access records, not the look on someone's face.

Just before midnight, Seojin filled in the blanks on the gray sheet. Extracted word, lost word, time of use, time of report. This time she didn't hide her use of the ability.

The team didn't forgive her. Instead, they suspended her analysis rights, kept her on as an observer, and had the others go back over the same material.

That was the first real rule the gray room made that day. Trust wasn't sharing a secret. Trust was actually exercising the authority to stop one another.