The Valve Stamped With an Employee Number

A new tag hung on Valve 3 at the pump station.

Instead of a part number, it carried Im Seoha's employee ID.

Baek Dowon didn't touch the tag.

Inside, a children's safety broadcast was counting people.

"One, two, three. One child remains."

At 3:08 AM, in front of the steel door of the closed Northwest Pressure Pump Station No. 4, the broadcast repeated the same sentence. No child's laughter or crying. Just the safety training audio played through a low speaker.

Dowon didn't touch the door. He looked at the ground first. On the gravel at the entrance, there was a single line of rubber boot prints. The prints going in were deep. There were none coming out. No child's sneakers or small footprints anywhere. Even shining his flashlight over the drier patches of dirt, he found only one pair of security patrol boots.

Seoha stood four steps behind with the offline clock and the scene photo envelope. "Scene check 4721. Standing by at the entrance."

Dowon pressed the radio button once short, once long. The same sequence came back from the center. "Wiring and valve, 3184. No evidence of a child's presence. One set of security boot prints going in."

The patrol tag on the right side of the door showed a last contact time of 02:50. The hook beside it was empty, the spot where the night guard's key ring usually hung. One missing item, one line of boot prints going in. Both pointed to the possibility that the guard was inside.

Dowon only photographed the new tag. On the front: `4721`. In the spot where the original part number should have been. The metal edges were bright, no tool marks on the bolts. It didn't look like a tag that had been mounted for a long time. It looked freshly fitted.

"Don't write the name," Dowon said. "Employee ID, front side only. No contact."

Seoha erased her own name from the record title and wrote it down as is.

The door's lock still had power. The card reader displayed the message: `Only completed personnel may pass`. Dowon didn't tap his own ID card. There was no reason to test on scene whether a completed status could confirm a person's absence.

Instead of the emergency call button, he spoke toward the ventilation gap beneath the door. "Night guard. Don't say your name. If you can hear me, shine your flashlight on the floor twice."

Light passed across the floor twice from inside. The first was white, the second yellowed from a weak battery.

"Where's your patrol tag?"

"Inside the door. The key won't come out." A man's voice answered. "The water's up to my waist."

Dowon studied the boots visible through the ventilation gap. The tops and soles of the black rubber boots were dry. There was no water reflection or floating debris on the ground either. The man believed he was submerged, but his boots weren't wet.

"We look at everything else before the water," Dowon told Seoha. "The status message might have built the environment description."

Seoha reported to the center. "One guard estimated. Boots dry. Physical flooding not confirmed. Complete action prohibited."

Mijin's voice came back. "Center confirms. Daycare is currently doing a headcount, no report of a remaining child."

The broadcast kept insisting one child remained. Dowon prioritized citizen contact and footprints over the voice.

The control box beside the door had a manual angle gauge for Valve 3. The needle trembled, caught between the Hold section and the Complete section. The pump station's water level gauge read 22 percent. Dowon photographed the angle gauge and water level gauge in one frame, keeping the tag only at the edge of the shot.

"Running a small state test," Seoha said. "Bypass drainage section, no one present. 2 second hold, immediate revert. Measuring scene delay."

Dowon looked back at the exit before answering. Seoha outside the door, the open outer fence, the emergency shutoff handle. The guard's passage was a different branch from the valve being tested.

"Last time in Sanghoo, I trusted a single sound and went in first," Dowon said. "This time, if I say stop, end it immediately."

It was the first time he'd shared his own guilt and possible failure in a single sentence before acting.

Seoha pressed the radio twice. "Scene stop authority, 3184. Center, Yuna handles the state operation. Team lead Mijin cross checks the time."

Yuna answered from the center. "Hold scheduled 03:14:20.000, 2 seconds. I'll read out until screen restoration."

Dowon attached a magnetic scale beside the manual angle gauge. He didn't touch the valve by hand. Seoha held the offline clock inside the frame. The delay between the center and the scene, based on the previous radio exchange, was about 4 seconds.

"Hold."

Yuna's word was heard at 03:14:24.

Four seconds later than the center's operation. The angle gauge needle moved one notch to the right. From beneath the floor came a sound, not water, but metal gears meshing. The water level gauge rose from 22 to 23 percent.

According to the center's log, Yuna pressed the revert button 2 seconds later, at 03:14:22. That word reached the scene by radio at 03:14:26.

The angle gauge stopped there. It didn't return to its original position. It stayed at the half notch to the right. The water level didn't drop back from 23 percent either.

A single drop of rust colored water rose from the dry drainage groove beneath the valve. It didn't flow, only left a round mark at the joint. Dowon didn't touch it. He drew a chalk baseline outside the mark. Ten seconds later, the water's edge had crossed the line by 2 millimeters. Slower than the water level gauge's number, but a second physical change in the same direction.

Dowon photographed the chalk and the clock in one frame and raised his hand. "Test ended. No further operations. Revert failed at half notch. Joint seepage, 2 millimeters."

Seoha relayed the same words to the center. It was limited physical evidence that Hold didn't eliminate danger but actually moved the valve, and that a revert command didn't guarantee full restoration either.

The message on the card reader changed.

`Held personnel must wait`

The man inside knocked on the door. "The water's rising more."

His boots were still dry. Dowon didn't touch the valve further in response to the flooding claim.

"Tell me what patrol items you carry every day. Not your name."

"Key ring, flashlight, guard log."

"Where's the spare flashlight battery?"

"Second drawer under the logbook cabinet. New ones on the right, used ones on the left."

Dowon checked the same layout in the outer guard cabinet. In the second drawer, two packaged batteries on the right, four dated dead batteries on the left. The company manual had no such left right arrangement. It was a habit only someone who'd worked the daily shift would know.

"Who handed you the keys?"

The man answered with a title instead of a name. "Day shift guard. 18:02. Big key first, then the patrol tag."

"The order to hand them back on the way out."

"Patrol tag, log, big key. Flashlight goes in the charger."

Reciting the sequence from memory wasn't enough. Dowon opened the narrow return slot at the bottom of the door and pushed an empty tray through without putting his hand inside. "Key ring and patrol tag. In the order you said."

Metal clinked from inside. The patrol tag came out first. The man stopped.

"Wrong order," Seoha said.

"Wait, I just..."

The man didn't take the tag back. He set it aside on the tray and placed the big key first. Then the patrol tag, then the folded guard log. Admitting the mistake and correcting the order was something the duplicated voice from the cabinet had never been able to do.

Dowon didn't claim ownership of the items himself. He pushed the whole tray toward Seoha and they photographed it from different angles. The last line of the guard log read: 02:50, pump station underground broadcast inspection. He covered the name field and read only the title and time.

The card reader gave a short approval tone.

`Handover confirmed`

The door's lock released.

Dowon didn't swing the door wide open. He opened it just a hand's width and looked at the actual floor first. There was no water. The man stood leaning against the wall in dry boots. Believing the water had reached his waist, he was holding both hands up in the air like he was keeping them above a surface.

"Look at the floor. No water. Big key handover confirmed. Three steps to the door now."

The man didn't say his name, just looked at the toes of his boots. One step, two, three. Once he crossed the threshold, he lowered his hands.

The children's safety broadcast counted again.

"One, two. One child remains."

Even with the guard out, the count dropped by one but the claim of a child remained. There was still no evidence of an actual child.

Dowon handed the guard off to Seoha beyond the outer fence. "One guard rescued. Boots dry. Name not confirmed. Standing by for medical."

Seoha checked the guard's patrol tag and log times separately. "Center, item handover matches the one person on scene. Child's existence remains unconfirmed."

Mijin answered. "Daycare's full headcount confirmed. No basis to connect the broadcast's child."

The first rescue on scene ended without a Complete button. The guard was alive outside the pump station, and the ticket was still open.

Dowon went back to the control box. Valve 3's angle remained at the half notch. Without touching the front side tag reading 4721, he slid a small mirror in behind it.

On the mirror's reflection of the back of the tag, numbers were being engraved.

4.

7.

2.

1.

Deeper than the ones on the front. No filings around the edges, as if pushed up from inside the metal.

When Seoha stepped closer, Dowon didn't stop her with his hand. "Look, but don't pull it off. We leave it as evidence."

Seoha confirmed it was her own employee ID and still didn't pull the tag off. She captured the offline clock, the mirror, and the valve angle in one frame. She didn't damage the scene or mark the guard as Complete just to reclaim her own name.

Back at the center, Yuna read out the final times. "State hold, 03:14:20. Scene movement, 03:14:24. Revert, 03:14:22. Scene stop, 03:14:26. Delay of 4 seconds each."

Dowon wrote it in the repair log. `Valve 3 revert failed, half notch. No contact with tag. 4721 engraved front and back.`

The ambulance carrying the guard left. The children's safety broadcast didn't stop.

Dowon didn't go looking for other footprints deeper in the pump station. Instead of chasing a child who wasn't there and abandoning the exit, he handed off the living guard and the physical change evidence first.

As he and Seoha stepped out through the outer door, two radio confirmation tones passed back and forth.

After that, Valve 3 moved half a notch again, with no operation at all.