After the Snow Market courier left, the gray mist behind the cabinet slowly drew closed again.
The white corridor narrowed with it, until only a thin current of cold air still seeped into the store.
But the cartload of goods left at the threshold remained.
Snow salt crystal blocks.Sealed energy tubes.Low-temperature suppression cases.And those black sealed crates.
Every piece of it caught the store lights with a hard, cold gleam, as if whole slabs of another world's winter night had been cut out and shoved directly to her door.
Su Yu stared at the cart for a long time before finally whispering,
"...So all of that counts as yours now?"
"Anything left at my threshold counts," Lin Wu answered smoothly.
Then she stepped over, reached out, and touched the nearest snow-salt crystal.
It was brutally cold in her hand, like compacted ice-salt with a crust of frost over it. The moment her fingers brushed it, the system prompt appeared.
[Snow Salt Crystal Blocks ×24][Uses: Low-temperature preservation, contamination suppression, doorside basic currency][Note: One of Snow Market's common hard currencies.]
Excellent.
Not just goods.
Money.
The light in Lin Wu's eyes sharpened immediately.
With one motion, she stored the first six blocks into warehouse space, and the system followed with a new line:
[Detected: Structured doorside merchandise.]["Doorside Shelf" available for activation.]
There it was.
Lin Wu barely hesitated.
She activated it.
The next second, the ordinary shelving unit beside the Special Goods Cabinet—the one that had only held two rows of cookies and drinks—gave a faint tremor. The plastic price strips curled up by themselves. A ring of fine silver lines surfaced along the shelf edges, and the entire rack shifted into colder, steadier dark-gray metal.
At the very top, four words slowly lit up:
Doorside Shelf
Su Yu stared.
"It... grew again."
At this point, she truly believed the store was alive.
Lin Wu, meanwhile, was in an excellent mood.
Good.
Goods delivered at the door. Stocked inside. That was what a real supply chain looked like.
She moved briskly, placing the snow-salt crystals on the top tier, the military-spec sealed energy tubes on the second, then turning to the long low-temperature suppression cases.
"Professor," she said, looking at Zhou Qiming. "These?"
Zhou was still digesting Snow Market queueing customers and Gray Tower is looking this way. The question pulled him back. He stepped forward, looked once, and his face changed slightly.
"These are crude suppression cases used on the other side," he said. "Usually for storing small contaminated fragments, residue, or—"
He paused.
"Things scraped off the edge of a door."
The line wasn't explicit, but everyone in the store felt the chill inside it.
Things scraped off the edge of a door?
What kind of thing required a dedicated case just to hold it?
Lin Wu, however, didn't flinch.
Her favorite category of merchandise had always been:
other people say dangerous, the system says valuable.
"Put them on the third tier," she said.
The system didn't flash red.
That meant that, at least for now, bringing them into her store wouldn't immediately blow anything up.
Soon, the first three levels of the Doorside Shelf were stocked.
On one side, the ordinary shelves still held instant noodles, bottled water, bread, and medicine.
On the other, the new shelf now carried snow-salt crystals, sealed energy tubes, suppression cases, and black sealed crates.
One side looked like a post-apocalypse convenience store.
The other looked like a trade counter forged by two worlds colliding.
Standing between the two rows, Lin Wu looked once and finally felt something solid settle into place.
This, finally, felt like opening for business.
Not the earlier version—where she'd been nudging a door open bit by bit with a few buckets of noodles and some bottled water.
"Now," she said, turning toward Qi Ye, "you can tell me."
"What exactly is the Gray Tower?"
The question dropped, and the atmosphere—which had loosened just slightly while she stocked goods—tightened again all at once.
Qi Ye looked at the black crates on the Doorside Shelf and stayed silent for several seconds before speaking.
"The Gray Tower isn't a tower."
"At least, not only that."
Lin Wu didn't interrupt. She waited.
Qi Ye's gaze was cold, like he had to dig the words out from under deep snow.
"Where we come from, Snow Market is where trade happens. Drifters. Hunter groups. Recovery crews. Black doctors. Weapon mechanics... everyone can trade there. There are rules. Queues. Messages passed."
He paused.
"But Gray Tower is different."
"It doesn't queue customers. It doesn't bargain. It doesn't take ordinary goods."
Then he looked up.
"It only collects three things."
"Doors."
"Keys."
"And people chosen by the door."
At the shelves, He Qing's face drained of color.
Su Yu tightened her hold on Sui Sui too.
The line sounded like something out of a nightmare.
Lin Wu only caught the core thread.
"What do you mean by 'collects'?"
Qi Ye was quiet for one second.
"I mean exactly that."
"When Gray Tower finds a door it wants, that door either gets sealed or occupied. When it finds a key, that key either gets bought... or taken apart."
He paused.
"And if it wants a person..."
His voice dropped lower.
"They either disappear."
"Or from that point on, they work for Gray Tower."
Rain still tapped outside, but the store itself had gone hollow-silent.
Even Qin Zheng—who didn't belong to the doorside world at all—looked darker now.
Because this no longer sounded like some wasteland faction.
It sounded like something systematized.
Something that hunted doors.
"Who's behind the Gray Tower?" Pei Wan asked suddenly.
"No one knows," Qi Ye answered immediately. "Some say it's the first survivors who made it through behind the door. Some say it's the research people who lived through the collapse of the old experimental city."
He glanced once at the gray mist behind the Special Goods Cabinet.
"And some say... the Gray Tower wasn't built by people at all."
That one made even Zhou Qiming's breathing catch.
If Snow Market is queueing customers still sounded like an organized settlement on the other side, then Gray Tower wasn't built by people tore straight through that last layer of ordinary human logic.
Lin Wu still didn't let herself get dragged off course.
She only asked:
"So why is it watching a lit black shop?"
Qi Ye looked at her, and for the first time, his gaze was so dark it was almost black.
"Because a door that's lit steady isn't a one-time crack."
"It's business."
"It's a route."
"And it's..." he paused, "a place that can keep growing."
The last sentence was quiet.
Heavy enough to sink.
Lin Wu understood immediately.
Gray Tower wasn't staring at tonight's noodles and crystal cores.
It was staring at what this store could become.
A stable door.
A sustainable route.
An anchor that could grow its own shelves, rules, and customer flow.
Anything like that—anything—would attract a hand reaching for it.
"That's why you said it's already looking toward the light," Lin Wu said, tapping the ledger once. "Not it's coming."
"It's already looking."
"Yes," Qi Ye said quietly. "Doors watched by Gray Tower rarely stay peaceful."
As if in answer, the black sealed crate on the lowest level of the Doorside Shelf gave a soft click.
Not loud.
But enough to turn every head.
Lin Wu's eyes sharpened. She looked at the system immediately.
[Abnormal doorside object detected.][Black sealed crate (missing registry number) is showing active response.][Note: Item was not normally registered through Snow Market.]
Good.
So something dirty had indeed been mixed in.
She'd felt that from the start.
The courier had pushed an entire cart of goods through, and the system had identified every other item cleanly. Only these black crates had remained labeled unknown sealed crate with no deeper line item.
Which meant what was inside was probably not ordinary merchandise.
Possibly not even part of the goods Snow Market had meant to send her at all.
"Don't touch it," Lin Wu said first.
Because she had already seen one of the Second Team operatives outside instinctively start forward.
The crate clicked again.
This time, the thin silver line along one edge tightened by itself, as if something inside were slowly pressing outward.
Zhou Qiming's face changed immediately.
"This isn't a normal sealed crate. This is—"
He never finished.
Qi Ye spoke first.
"Gray Ticket."
Cen Dong snapped her head up, and for the first time, her expression truly changed.
"Snow Market dared slip in a Gray Ticket?"
Qi Ye's voice went cold.
"Whether they dared isn't the point. They did."
Lin Wu looked at the crate.
"What's a Gray Ticket?"
"A registered notice from Gray Tower to a door." Qi Ye said every word clearly. "Not an invitation."
"A notice."
He stared at the black crate now making soft sounds on its own.
"It means..."
"they know this place lit up."
The store went very quiet.
Even the gray mist behind the Special Goods Cabinet seemed to settle lower for a moment.
Lin Wu, however, did not panic.
She simply stood beneath the lights, looking at the crate, and the brightness in her eyes sharpened by degrees.
Good.
Snow Market queues customers.
Gray Tower sends notices.
At last, the real structure of the other side's order was beginning to lay itself out in front of her.
And right then, the system finally gave her a new line:
[Gray Ticket detected inside the store.][Please choose: Refuse / Hold / Open Ticket]
Lin Wu's fingertips touched the edge of the counter once.
She knew this wasn't just a letter.
It was a step—
one clean step into deeper water on the other side.
An invitation.
Or, more accurately—
a notification.
And this time, she couldn't just ask how much is it worth?
First, she had to decide whether she was taking it at all.