Oh Sejin's Lie

At 03:40, Gang Taejun set three empty boxes down in front of Oh Sejin.

There were no drugs. No harmful items either. Just transparent boxes of the same size, white labels, and direction markers. Go Yura had marked a small dot on the bottom of each box. The dot had no function. It was a reference point to check orientation.

"This is a test of safe object substitution."

Gang Taejun said.

Oh Sejin looked at the boxes and asked.

"Are you doing this because I'm the killer?"

"We also need you as a witness."

That answer stopped him for a moment. Calling someone a killer draws out defense. Calling someone a witness can sound like their responsibility disappears. Gang Taejun avoided both. Witness rather than killer. But that didn't mean he wasn't the killer.

Gang Taejun set one more sheet of paper in front of the boxes.

No leading conditions.

"Why is this necessary?"

Oh Sejin asked.

"So no one can claim we created your habit."

Go Yura answered.

He measured the distance between the boxes with a ruler. Too close and the hand reaches all three at once. Too far and the movement becomes conscious. Calibrating the gap between consciousness and habit turned out messier than it sounded. Gang Taejun didn't hide the messy part.

"I'll also read the conditions that would invalidate the test."

He said.

"If Oh Sejin demands an explanation, the test stops. If we suggest a specific direction, the test stops. If we ask a question before his hand touches something, the test stops."

I lifted my head at the last condition.

"Can a question itself be leading?"

"Sometimes."

Gang Taejun said.

"Especially yours."

I didn't argue. I couldn't claim I'd never moved someone with a question.

The first box had its label facing outward. The second faced inward. The third had its label facing up. Oh Sejin was given no explanation. His hand moved first. He turned the second box outward, then immediately turned it back inward.

Go Yura said.

"Why did you just turn it back?"

Oh Sejin stopped his hand.

"To face it in whichever way was easier to look at."

"Easier for whom?"

He couldn't answer.

Gang Taejun wrote down that silence. Silence doesn't always mean the same thing. This silence was the moment habit arrived before explanation.

"We're doing it again."

Gang Taejun said.

Oh Sejin raised his eyes.

"I just did it."

"Just now you showed your first reaction. This time we change the order."

Go Yura cleared the boxes away and set down three cards of the same size. Red, gray, white. No labels. No function. No direction markers. This time Oh Sejin didn't touch them.

"Why did you stop?"

Gang Taejun asked.

"Because there was no meaning to it."

"Did the boxes have meaning?"

"They had labels."

Go Yura wrote it down right away.

Directional habit strengthens when a label is present. No response to unlabeled cards.

That line worked against Oh Sejin, but it also put a limit on our own hypothesis. The habit wasn't some spell attached to his whole hand, it was a response that only appeared when it met a specific marker. Without this limit, we could pin any direction on Oh Sejin at all.

At 03:55, the second test proceeded alongside his statements.

In episode 18, Oh Sejin said he turned the cartridge to check it. In episode 27, he said it was to restrain something. Just now, he said it was to face it a way that was easier to look at. All three sentences pointed to the same hand, yet each attached a different purpose to it.

Gang Taejun didn't read the three sentences in order. He scrambled the sequence. Easier to look at, restrain, check. When people hear things in order, they adjust the later statement to match the earlier one. Scrambled, the meaning shows through more.

"Which of these is the lie?"

Oh Sejin didn't answer right away.

"Do you mean I should pick just one?"

"No. All of them could be true, or all of them could be false."

At that, Oh Sejin's face fell a little. People usually want to pick out one lie and let the rest stand. Gang Taejun blocked that path.

"Which sentence is correct?"

Gang Taejun asked.

"The situation was different each time."

"Then tell me the situations."

"Episode 18 was checking. The original timeline was restraining. This test is habit."

"Then what about the direction of the victim's belongings in episode 5?"

For the first time, Oh Sejin's eyes turned to me. The left pocket in episode 5. The moment Yun Haewon's admin key had ended up somewhere other than usual. We never saw the hand that time. Only the direction.

"I didn't move the body."

"What about the belongings."

He didn't answer right away.

"I arranged them."

Gang Taejun wrote the words down.

"Is arranging different from moving?"

"They're different."

"And the result?"

Oh Sejin didn't close his eyes.

"It could be the same."

There was no acquittal in that either. He'd split the words apart but hadn't denied the outcome. Whether that counted as progress or as defense, we still couldn't tell.

"The time you arranged them."

"I don't remember exactly."

"Not remembering and not being able to say are different things."

Oh Sejin reacted to that line. His throat moved, just barely.

"I can't say."

Gang Taejun waited.

"Why."

"If I say the time, I'll also have to say what I saw before it."

The air in the room thinned again. He wasn't just someone who had arranged the belongings, he was someone who had seen something before arranging them. But Gang Taejun didn't press the question right away.

"That's the next question. Right now the question is the belongings."

He drew a line. Open too many doors at once and Oh Sejin would run for the narrowest one.

At 04:20, Go Yura split the test footage into three panels.

The first panel was the episode 18 cartridge. The second was today's boxes. The third was the record of the victim's belongings from episode 5. Only direction was left in each. Faces were blurred out. With a face in view, we try to read expression. Expression wasn't what we needed right now.

"There's a pattern."

Go Yura said.

"It's not a lie detector."

I said.

She nodded.

"That's why we have to attach a question to it."

Go Yura put a black bar under the screen.

Pattern is for generating questions. Not for determining guilt.

She deliberately made the text large. So everyone in the room could see it. It was the kind of line Hong Sanguk would have sneered at. But without a line like that, we'd pay a price bigger than being sneered at, later.

"There are plenty of people who share the same direction."

Go Yura continued.

"The gray raincoat matched the same direction too."

At that, Oh Sejin looked straight at Go Yura for the first time.

"Do you mean someone copied me?"

"It means I won't rule out that possibility."

That answer neither saved Oh Sejin nor cornered him. Possibility isn't a comfortable word. Used precisely, it makes both sides uncomfortable.

Gang Taejun attached a question.

Reason for stating a different purpose each time the direction was changed.

The question pressed Oh Sejin hard, but it didn't break him. He wasn't a man who had completely collapsed. He still had the strength to choose the sentence that favored him. That was exactly why we had to be more careful.

"I'll ask this as a witness question."

Gang Taejun said.

"What's the difference from asking me as the killer?"

Oh Sejin's voice roughened a little.

"If I ask you as the killer, you defend yourself. If I ask you as a witness, you have to say what you saw first."

"And what about what I did."

"I'll ask that after. It doesn't disappear."

Oh Sejin's eyes said he didn't trust that order. But Gang Taejun didn't change it. I thought I understood why. Right now Oh Sejin was the only inside hand we had. Just because that hand was dirty didn't mean we could throw away the direction it was pointing.

Yun Haewon spoke quietly.

"The witness seat can't become a hiding place for you."

"I know."

Gang Taejun answered.

He didn't take his eyes off Oh Sejin.

At 04:45, Oh Sejin picked up the third box.

"The lie I told was that there was no intent."

No one interrupted.

"There was intent. I wanted to say I never intended to kill, so I made it sound like there had been no intent at all."

At that, Yun Haewon picked up her water glass. She didn't drink. The handle faced right. It was a direction Noeul would have remembered, if she'd been here.

"What was the intent."

"To stop something."

"Stop what."

"The disclosure."

This time Yun Haewon drank the water. Just one sip.

"So you meant to stop me."

"Yes."

For the first time, Oh Sejin looked straight at Yun Haewon.

"I meant to stop you. I tried to erase that by saying I never meant to kill you."

Gang Taejun wrote down Oh Sejin's lie: no intent. The line looked like a headline, but it wasn't a verdict. Exposing one lie doesn't end the whole truth.

"There's one more."

Oh Sejin said.

Gang Taejun raised his pen but didn't write.

"Say it."

"I said I'd only been pushed around by Director Hong."

"Is that a lie?"

"It's half true."

He didn't close his eyes. He looked like someone trying to get used to saying things that hurt his own case.

"It's true I was pushed because of the 2019 file. But when I heard Deputy Director Yun was preparing to disclose it, I wanted to stop it myself, too. It wasn't only because someone ordered me to."

Yun Haewon didn't smile at that.

"So it wasn't me you feared. It was the file I was about to open."

"Yes."

Oh Sejin's answer was short again.

Gang Taejun wrote external pressure, voluntary desire to cover up. He didn't put a plus sign between the two items. A plus sign is too simple. Pressure and desire sometimes feed each other, and sometimes hide behind each other.

At 05:10, the test ended.

Go Yura didn't turn the three boxes back to their original orientation. She sealed them into envelopes exactly as they'd been left. Evidence shouldn't be tidied up. The hand that tidies becomes one more input of its own.

Just before she said that, Oh Sejin had been looking at the label on the box envelope. The label was still stuck on facing the direction it had ended up in. Oh Sejin didn't fix it. Not fixing it was also a choice. Maybe, for the first time, he'd just learned how to leave the misalignment his own hand had left behind. That misalignment pushed out his next words.

Oh Sejin looked at the envelope and spoke.

"Deputy Director Yun's emergency record isn't the original."

Every gaze in the room turned to him. This time he didn't run.

"What do you mean."

Gang Taejun asked.

"The record I saw and the record in the archive now are different."

"Which one is fake."

"The one that's there now."

Yun Haewon said quietly.

"You're saying my emergency record is fake?"

Oh Sejin nodded.

"At least, it's not the format I saw in 2019."

2019. That number again. The present cartridge traced back to a past format. A small direction test had opened a big door. Gang Taejun pulled out a new envelope with the same hand that had just sealed the boxes.

Verify the authenticity of Yun Haewon's emergency record.

"If the format is different, does that make it fake?"

Go Yura asked.

"Not always."

Oh Sejin answered.

"Then why did you call it fake?"

"There's a field missing."

He didn't raise his hand. Explaining with his hands would create another direction. This time he used words.

"An emergency cartridge record can't just have the patient's name, response time, and confirmer. There used to be a field for the scope of prior consent and a recommendation for cutoff attached. In the 2019 format I saw."

Gang Taejun stopped him right away.

"Don't explain the function. Just the field names."

"Understood."

Oh Sejin added.

"The patient's name is different too."

"Whose name."

He didn't answer right away. Not because he couldn't say it, but because he knew that if he said it, Mun Rahui would hear it.

For the first time, Mun Rahui rose from her seat at the end of the room.

Oh Sejin spoke without looking at her.

"Mun Hajin."

Mun Rahui's chair scraped the floor. The sound was brief, but everyone heard it. She didn't open with her usual to be precise. That silence was more precise than words.

Yun Haewon was watching Oh Sejin.

"You're saying my record had another patient's name in it?"

"They might not have even been a patient."

Oh Sejin said.

"So it's just a name?"

"It's the name as recorded."

Gang Taejun wrote down that distinction right away.

Mun Hajin: patient status unconfirmed, name as recorded.

Mun Rahui looked at the line and stepped forward.

"Don't write that name like that."

Her voice was low. What arrived before anger was the urge to correct. But this correction wasn't about a number. It was about a name.

Gang Taejun didn't erase it.

"If I erase it, it's not a record."

Mun Rahui didn't answer. Oh Sejin's lie hadn't ended with no intent. The name he'd brought out at the end tied Yun Haewon's emergency record to someone else's past. The habit test hadn't caught a lie. It had opened the format hiding behind the lie.