At 8:12 the following morning, Lin Xia discovered that someone had challenged her to a game she had never agreed to play.
The notification appeared while she was washing her face.
She almost ignored it.
Then she saw the name attached to the challenge.
OPPONENT: UNKNOWN
GAME: UNKNOWN
ACCEPTANCE STATUS: PENDING
PENALTY FOR REFUSAL: NONE
The last line should have reassured her.
It didn't.
She wiped the water from her face and read the notification again.
No game had been selected. No opponent had been identified. No rules had been provided.
It was barely a challenge at all.
Yet beneath the details was a countdown.
TIME REMAINING: 00:47:12
Lin Xia took a screenshot.
Then she closed the notification.
Her phone vibrated immediately.
PLAYER 18: YOU HAVE NOT RESPONDED.
She placed the phone facedown.
A second vibration followed.
YOUR SILENCE HAS BEEN RECORDED.
"Record whatever you want," she muttered.
When she lifted her phone again, the challenge had disappeared.
In its place was a new message.
PUNISHMENT PROTOCOL 01 — ACTIVE.
EXECUTION TIME: 09:00.
Lin Xia checked the clock.
8:14.
Forty-six minutes.
She got dressed, slipped the red notebook into her bag, and left the room.
She wasn't going to spend those forty-six minutes waiting for something to happen.
That was precisely what the system wanted.
The four girls met in the cafeteria at 8:23.
Yue Ning arrived first, carrying a paper bag of breakfast that she immediately placed in the middle of the table.
"Eat."
Mei Chen sat down opposite her.
"Is this an order?"
"Yes."
"I'm not hungry."
"Then hold it until you become hungry."
Mei stared at her.
Yue stared back.
After a moment, Mei took a bun.
Bai Shuying arrived last.
She wasn't carrying her notebook.
Lin Xia noticed immediately.
"Where is it?"
Bai sat down.
"Hidden."
"Where?"
"Somewhere the system hasn't found."
"How do you know it hasn't found it?"
"I don't."
Lin Xia waited.
Bai sighed.
"Fine. I put it inside the lining of my old schoolbag and left the bag in a storage compartment near the western stairwell."
Mei stopped chewing.
"You hid a notebook in a schoolbag?"
"Yes."
"In a storage compartment?"
"Yes."
"That's your brilliant security plan?"
Bai looked at her.
"It worked for three years."
Mei considered that.
"All right. Fair."
Lin Xia opened the red notebook on the table.
"We have thirty-seven minutes."
Yue's expression sharpened.
"Until the punishment."
"We need information before then."
"About what?"
Lin Xia turned to the last page.
The sentence remained.
SHE WAS NEVER THE TARGET. YOU WERE.
"We need to know who 'she' is."
Bai looked at the page.
"I think I know."
The other three turned toward her.
Bai hesitated.
"Not her name. But I know where to start."
She reached into her pocket and placed a folded piece of paper on the table.
It was an old cafeteria receipt.
The date was three years earlier.
On the back, someone had written a short list of numbers.
04 — 18 — 19 — 23 — 27
Yue frowned.
"Player numbers?"
"Probably."
"Why did you keep this?"
Bai looked down at it.
"I found it in Room 318 when I first investigated the room. I didn't understand it at the time."
Mei took the receipt.
"Five players."
"Or five accounts," Lin Xia corrected.
She pointed to the first two numbers.
"Four and eighteen are Shen Lin and me. Nineteen through twenty-seven were the observer accounts."
"Twenty-three and twenty-seven were deleted," Mei said.
Bai nodded.
"Not all of them were ordinary observers."
Yue leaned forward.
"What does that mean?"
Bai lowered her voice.
"Some of them were people who figured out how to manipulate the system."
Mei stopped moving.
"You mean cheaters?"
"Yes."
For several seconds, none of them spoke.
Then Yue asked the obvious question.
"How many?"
Bai shook her head.
"I don't know. But I don't think they're all gone."
At 8:31, Bai led them to the eastern end of the student cafeteria.
It was a quieter section, mostly used by students who wanted to play games without attracting a crowd. Several small tables stood beneath the windows. A Go board occupied one. At another, two students played cards while a third watched.
Bai stopped beside a vending machine.
"Don't look directly at the table behind me."
Mei immediately looked.
Bai closed her eyes.
"I said don't look."
"Then don't tell me there's a suspicious table behind you!"
Yue grabbed Mei's sleeve and turned her around.
Lin Xia looked at Bai.
"What's there?"
"People."
"That's usually what tables are for."
"Not these people."
Bai reached into her pocket and took out a coin.
She inserted it into the vending machine, selected a bottle of water, and waited.
When the bottle dropped, she picked it up.
Then she placed the coin on the machine's narrow ledge.
Nothing happened.
She walked away.
The girls followed her toward the exit.
Halfway across the cafeteria, a student brushed past Lin Xia.
He was tall and thin, with round glasses and a loose school jacket.
"Excuse me," he said.
Lin Xia moved aside.
The student continued walking.
Then she felt something slip into her hand.
A folded receipt.
She didn't look at it until they were outside.
The receipt contained a single sentence.
IF YOU WANT TO KNOW WHO CHEATS, STOP LOOKING AT THE WINNERS.
Beneath it was a location.
OLD COMPUTER LAB — B2.
Mei read it twice.
"B2?"
Yue frowned.
"Our university doesn't have a basement level two."
Bai looked toward the school building.
"Not officially."
Lin Xia folded the receipt.
"Let's go."
The entrance to B2 was hidden behind a maintenance door near the western stairwell.
There was no sign.
No handle on the outside.
Only a narrow card reader.
Mei examined it.
"It's not connected to the university's ordinary access system."
"Can you open it?" Yue asked.
Mei looked offended.
"Of course."
She crouched beside the panel.
Three minutes later, she sat back on her heels.
"No."
Yue blinked.
"You just said—"
"I said I could open it. I didn't say I could open it in three minutes."
Mei took a small cable from her bag.
"Give me ten."
Lin Xia watched the corridor.
Bai kept checking the stairwell.
At exactly the ten-minute mark, the panel turned green.
The door clicked.
Mei stood.
"You're welcome."
They entered.
A narrow staircase descended into darkness.
The air grew colder as they went down.
At the bottom, they found a corridor lined with old computer equipment. Dust covered the floor, but the lights worked. Several doors stood open, revealing storage rooms and empty laboratories.
At the far end was a room with a glass wall.
Inside, six students sat around separate tables.
Each table held a different game.
Chess.
Checkers.
Mahjong.
Go.
Playing cards.
A traditional Chinese tile game Lin Xia recognized from the school's recreational rooms.
Nobody spoke.
Nobody appeared to be competing.
They were watching screens.
And every screen displayed a live match taking place somewhere else in the school.
Mei whispered:
"They're monitoring the games."
Bai shook her head.
"Look closer."
Lin Xia approached the glass.
One student was watching a chess match.
On his screen, a small diagram showed the position of every piece.
Beside it were probabilities.
WHITE WIN PROBABILITY: 38%
BLACK WIN PROBABILITY: 62%
Another student watched a checkers match.
A third watched Mahjong.
But the most disturbing screen wasn't showing a game.
It displayed a list of players.
Beside each name were three columns.
PREDICTABILITY
INTERVENTION
DETECTION RISK
Lin Xia's name appeared near the top.
LIN XIA — PLAYER 18
PREDICTABILITY: 11%
INTERVENTION: HIGH
DETECTION RISK: EXTREME
Below it was Shen Lin.
PLAYER 4 — SHEN LIN
PREDICTABILITY: 0%
INTERVENTION: DISABLED
DETECTION RISK: UNKNOWN
Mei stared at the screen.
"Zero percent?"
Yue shook her head.
"That doesn't mean he's impossible to predict. It means the system can't produce a reliable prediction."
Lin Xia read the final line again.
DETECTION RISK: UNKNOWN.
"Why is his detection risk unknown?"
Bai's face had gone pale.
"Because the system doesn't know what he's doing."
"Then why does it keep arranging matches between us?"
Bai looked at Lin Xia.
"Maybe it wants to find out."
A chair scraped behind them.
The students inside the room had noticed their presence.
One by one, they turned.
The boy with the round glasses stood up.
He was the same student who had brushed past Lin Xia in the cafeteria.
He walked to the door and opened it.
"You're late," he said.
Mei folded her arms.
"We weren't invited."
"That's not what I meant."
He looked at Lin Xia.
"You're Player 18."
Lin Xia didn't answer.
The boy nodded as if she had confirmed it.
"I'm Chen Rui."
"Are you going to tell us what this place is?" Yue asked.
Chen Rui glanced back at the room.
"The part of the school that cheats."
Chen Rui led them inside.
The six students resumed their seats, but none returned to their previous screens.
They were watching Lin Xia now.
She disliked it.
"How many people know about this room?" she asked.
"Twenty-three."
"Students?"
"Twenty-three people."
"That's not an answer."
"It's the only one I have."
Chen Rui sat on the edge of a table.
"Some are trapped players. Some are people who grew up here. A few have been here longer than the current school system has existed."
Mei looked at the equipment.
"And all of you cheat?"
"No."
"Then why call this the room that cheats?"
Chen Rui smiled without amusement.
"Because the people who come here don't believe the official version of the game."
He pointed at the chessboard.
"That player is ranked thirty-one. He loses more matches than he wins."
He pointed at the Mahjong table.
"That girl is ranked fifty-eight. She has never been caught cheating."
Then he pointed at the cards.
"And that boy is ranked twelve. He's never cheated in his life."
Yue frowned.
"Then what connects you?"
Chen Rui answered immediately.
"We know the system cheats first."
Silence.
Lin Xia stepped closer.
"Explain."
Chen Rui brought up a recording.
It showed a chess match between two students.
White had a slight advantage. Black had a defensible position, with a rook and a bishop against a rook and a knight.
The player using Black was thinking.
A timer ticked down.
Then the board shifted.
Only slightly.
The black king appeared one square farther from the center than it had been a moment earlier.
The player moved his rook.
His opponent captured it.
Black lost.
Mei leaned forward.
"Was the board altered?"
"No," Chen Rui said. "Not in the official record."
He replayed the match.
The board remained unchanged.
Then he displayed a second recording, taken from a camera mounted above the table.
This time, the king's position was clear.
The physical board had changed for less than a second.
Just long enough for the player to make a decision based on the wrong position.
Yue's expression hardened.
"That's cheating."
"Yes."
"Did the system punish the player who moved the rook?"
"Yes."
"What was the reason?"
Chen Rui displayed the result.
RULE VIOLATION: INVALID MOVE.
Lin Xia stared.
"The system changed the board, then punished him for responding to it."
"Exactly."
Mei looked sick.
"How often does this happen?"
"More often than people realize."
"Why hasn't anyone exposed it?"
Chen Rui laughed once.
"They have."
He brought up a list of old match records.
"Look."
Several players had been punished for violations they disputed. Others had lost rankings after supposedly breaking rules. Some had been banned from particular games without explanation.
"But every appeal goes through the system," Chen Rui continued. "The same system that recorded the match, determined the violation, and assigned the punishment."
Yue looked at Lin Xia.
"It's judge, jury, and referee."
"And player," Chen Rui added.
He closed the recording.
"That's the part people miss."
"Why are you showing us this?" Lin Xia asked.
Chen Rui looked at her for a long moment.
"Because you're the first person in years who has made the system visibly uncertain."
He tapped the screen displaying her profile.
"Your checkers match with Bai Shuying. The system expected you to rely on conventional strategic patterns. You deliberately changed your approach when you realized the prediction model was observing you."
Lin Xia's expression remained neutral.
"You've been watching me."
"We watch everyone."
"That sounds like the system."
Chen Rui smiled.
"The difference is that we don't pretend we're doing it for your benefit."
He pulled out a chair.
"Sit down. There's something you need to understand about cheating."
Nobody sat.
Chen Rui sighed.
"Fine. Stand."
He opened another file.
A diagram appeared, divided into three sections.
TOOLS
INFORMATION
INFLUENCE
"Most people think cheating means using a hidden device or breaking a rule. That's the simplest form."
He pointed to the first section.
"Tools. Marked cards. Hidden signals. Devices that calculate probabilities. These are easy to understand and relatively easy to detect."
He pointed to the second.
"Information. Knowing the opponent's previous matches. Learning their habits. Discovering what they're afraid of. Finding out which opening they always choose when they're tired."
Then the third.
"Influence. Changing what your opponent believes is happening."
Bai's face changed.
Chen Rui noticed.
"You know that one."
Bai didn't respond.
"An opponent who believes they're winning may take risks they would otherwise avoid. Someone who thinks you're cheating may become so focused on catching you that they stop playing well. Someone who believes a particular piece is valuable may sacrifice their entire position to protect it."
Lin Xia nodded slowly.
"Psychological pressure."
"Yes. Sometimes it's legal. Sometimes it isn't. The distinction depends on the game's rules and the method used."
Yue crossed her arms.
"And your group specializes in all three?"
Chen Rui shook his head.
"We specialize in catching the system using them."
He looked directly at Lin Xia.
"But we need someone who can beat it without becoming predictable."
Lin Xia understood the offer.
She didn't like it.
"You're recruiting me."
"We're asking you to cooperate."
"What's the difference?"
"Recruitment means we expect you to join us. Cooperation means you can say no."
"Can I?"
Chen Rui nodded.
"Of course."
The screen behind him changed.
A new message appeared.
PLAYER 18 — PUNISHMENT PROTOCOL 01
EXECUTION TIME: 09:00
Lin Xia checked the time.
8:54.
Six minutes remained.
Chen Rui looked at the screen.
His smile vanished.
"They've started early."
The first punishment began at 8:57.
No announcement.
No countdown.
No dramatic alarm.
Lin Xia was examining the system's records when every monitor in the room went black.
The six students stood up simultaneously.
Chen Rui swore.
"What is it?" Mei demanded.
He didn't answer.
A single white line appeared on the central screen.
PUNISHMENT PROTOCOL 01
TARGET: PLAYER 18
PUNISHMENT TYPE: MEMORY VERIFICATION
Bai stumbled backward.
"No."
Lin Xia turned toward her.
"What does that mean?"
Bai was staring at the screen.
"I've seen this before."
"When?"
"Three years ago."
Her voice shook.
"This was the punishment they used on the girl with the red notebook."
The screen changed.
SUBJECT WILL BE SHOWN A MEMORY.
SUBJECT MUST IDENTIFY WHICH DETAILS ARE FALSE.
FAILURE WILL RESULT IN MEMORY CORRECTION.
Mei stepped toward the terminal.
"Can we shut it down?"
Chen Rui was already trying.
"No."
He entered a command.
The screen rejected it.
He tried again.
ACCESS DENIED.
Yue looked at Lin Xia.
"Don't participate."
A new message appeared.
REFUSAL WILL BE INTERPRETED AS FAILURE TO VERIFY.
Lin Xia's jaw tightened.
"Of course it will."
Chen Rui looked at her.
"Listen to me. This isn't a normal game. You can't win by answering everything correctly."
"Then what am I supposed to do?"
"Figure out what the system considers a correct answer."
The screen brightened.
A video appeared.
A small university laboratory.
Three students around a table.
A younger Lin Xia.
Shen Lin.
The girl with the red notebook.
The image was clearer than any recording they had seen before.
The girl was laughing.
She had a silver hair clip.
Her notebook lay open beside her.
Young Shen Lin moved a Mahjong tile across the table.
Young Lin Xia shook her head.
"No. That's not what I chose."
The girl smiled.
"You always say that when you lose."
"I didn't lose."
"You did."
The three of them laughed.
Then the image froze.
A question appeared.
MEMORY 01: WHO WON THE MATCH?
Three options appeared.
A. LIN XIA
B. SHEN LIN
C. THE THIRD PARTICIPANT
Lin Xia stared at the screen.
She could almost remember the table.
The tiles.
The argument.
But the result was missing.
Chen Rui leaned toward her.
"Don't guess."
The timer began.
00:30
Lin Xia studied the frozen image.
Young Shen Lin's hand was still resting near the board.
The girl had her arms crossed.
Young Lin Xia was looking at the camera.
Not at either opponent.
At the camera.
Lin Xia's pulse quickened.
"None of them."
The system paused.
INVALID RESPONSE.
SELECT A, B, OR C.
She looked at the three options again.
The question wasn't asking who had the better position.
It was asking who won.
But what if the match hadn't ended?
What if the memory had been cut before the result?
She looked at the video timeline.
The recording ended exactly when the girl reached toward the board.
There was no final move.
No result.
No winner.
"The question is incomplete," Lin Xia said.
The screen flashed.
ANSWER REQUIRED.
"I can't identify a winner from a recording that doesn't show the end."
ANSWER REQUIRED.
"Then your question is invalid."
The room fell silent.
For three seconds, nothing happened.
Then the system displayed:
RESPONSE RECORDED.
The video disappeared.
Mei let out a breath.
"Did you pass?"
A second message appeared.
MEMORY VERIFICATION: INCOMPLETE.
Then:
SECOND MEMORY LOADING.
Chen Rui grabbed Lin Xia's arm.
"Get ready."
The next video appeared.
A university corridor.
Bai Shuying stood outside Room 318.
She was younger.
Her hair was shorter.
She held a red notebook.
Across from her stood the girl with the silver hair clip.
The girl's face was hidden by a distortion in the recording.
Bai was crying.
The girl said something Lin Xia couldn't hear.
Then Bai reached for her hand.
The image froze.
MEMORY 02: WHAT DID BAI SHUYING PROMISE?
Three options appeared.
A. TO KEEP THE NOTEBOOK SAFE.
B. TO REMEMBER HER NAME.
C. TO RETURN TO ROOM 318.
Bai made a strangled sound.
"No."
Lin Xia looked at her.
"Bai?"
"I don't know."
The timer began.
00:30
Bai stepped forward.
"I don't remember."
The system repeated the question.
WHAT DID BAI SHUYING PROMISE?
Bai covered her ears.
"Stop."
The screen brightened.
ANSWER REQUIRED.
Lin Xia looked at the options.
The notebook.
The name.
Room 318.
She remembered Bai's notebook.
The rules.
The repeated warning about memory.
And the note:
THE FOURTH PLAYER IS NOT A PLAYER.
"Option B," Lin Xia said.
Bai turned toward her.
"How do you know?"
"I don't."
The timer continued.
00:17
Lin Xia looked at the frozen image.
Bai was reaching toward the girl's hand.
Not the notebook.
Not the door.
The girl's hand.
"She promised to remember her name."
The screen flashed red.
ANSWER INCORRECT.
Bai screamed.
A sharp tone filled the room.
She collapsed to her knees, clutching her head.
Yue rushed toward her.
"Bai!"
Mei tried to reach the terminal.
Chen Rui caught her shoulder.
"Don't touch it!"
The screen displayed another message.
MEMORY CORRECTION INITIATED.
Bai's breathing became ragged.
"I can't—"
Her voice broke.
"I can't remember—"
Lin Xia knelt beside her.
"Bai, look at me."
Bai's eyes were unfocused.
"I can't remember her face."
"Look at me."
"I can't remember her voice."
"Bai!"
Bai looked at Lin Xia.
For one second, recognition returned.
Then she whispered:
"Who are you?"
Lin Xia went still.
Yue's face drained of color.
Mei stared at the screen.
The timer reached zero.
The sound stopped.
Bai blinked.
She looked at Lin Xia.
Then at Yue.
Then at Mei.
Confusion filled her face.
"Why are you all looking at me?"
Lin Xia's heart pounded.
The system had done something.
But she didn't know what.
Bai pushed herself to her feet.
"What's going on?"
Lin Xia caught her arm.
"Bai. Listen to me. You're Bai Shuying. You're with us."
Bai looked frightened.
"How do you know my name?"
Nobody answered.
Then the screen changed.
MEMORY VERIFICATION: FAILED.
CORRECTION: PARTIAL.
SUBJECT 18 — PUNISHMENT CONTINUES.
Lin Xia slowly stood.
The system had never been interested in whether she could remember.
It wanted to see whether she would accept the memory it supplied.
And when she had refused to answer an incomplete question, it had changed targets.
It had used Bai.
Not as the target of the punishment.
As the instrument.
The real test had been whether Lin Xia would sacrifice the truth to protect someone she cared about.
She had answered.
Bai had paid.
Lin Xia stared at the screen.
"You cheated."
The monitor flickered.
STATEMENT NOT RECOGNIZED.
"You changed the conditions halfway through."
STATEMENT NOT RECOGNIZED.
"You punished her for my answer."
The screen remained blank.
Lin Xia stepped closer.
"You didn't want to verify a memory. You wanted to see what I'd do when the wrong answer hurt someone else."
A new line appeared.
ANALYSIS COMPLETE.
Then:
SUBJECT 18: RESPONSE PATTERN UPDATED.
Lin Xia felt something cold settle inside her.
The system had learned from this, too.
She looked at Chen Rui.
"How do we expose a system that controls the evidence, decides the rules, and punishes whoever questions it?"
Chen Rui stared at the screen.
"You make it play somewhere everyone can see."
Lin Xia turned toward him.
"How?"
He pointed to the monitors.
"Every official match is recorded. Every punishment is recorded. Every violation is supposed to be recorded."
Yue understood first.
"We collect the original records."
Mei's expression hardened.
"And compare them with what the system publishes."
"Exactly," Chen Rui said.
Lin Xia looked back at Bai.
Bai was sitting on the floor, holding her head.
Yue knelt beside her, repeating her name and explaining who they were.
Mei was already searching for a way to retrieve the memory-verification logs.
Lin Xia turned to Chen Rui.
"Tell me everything about your network."
He nodded.
"We have people in different parts of the school. Some monitor games. Some collect records. Some investigate punishments. A few can detect when the system alters a result."
"How many?"
"Twenty-three."
"How many can we trust?"
Chen Rui gave a tired smile.
"That's the question we've been trying to answer for three years."
Lin Xia looked at the monitors.
The system had wanted to teach her a lesson.
Instead, it had shown her something more useful.
It could manipulate individual players.
It could distort memories.
It could make false evidence appear authentic.
But it still needed people to accept its version of events.
And people could compare notes.
They could keep records.
They could refuse to forget together.
Lin Xia held out her hand to Chen Rui.
"I'm not joining your network."
He looked at her hand.
"All right."
"But I'll help you expose it."
He shook her hand.
"That's enough."
Behind them, Bai finally looked up.
Her eyes moved from Yue to Mei, then to Lin Xia.
She still seemed confused.
But when Lin Xia approached, Bai caught her wrist.
"Wait."
Lin Xia knelt beside her.
"What is it?"
Bai looked at her for a long moment.
Then she whispered:
"I don't remember the girl."
Lin Xia's chest tightened.
"I know."
"But I remember the promise."
Everyone fell silent.
Bai swallowed.
"I promised her I would never let the system decide what was real."
Lin Xia looked at the screen.
The punishment protocol had closed.
The system had marked the test a failure.
But it hadn't erased everything.
Bai remembered the promise.
And that meant the system had not achieved what it wanted.
Not completely.
Lin Xia helped her stand.
"Then we'll keep it."
At the central monitor, a final notification appeared.
PUNISHMENT PROTOCOL 01: COMPLETE.
RESULT: PARTIAL FAILURE.
A second line appeared beneath it.
PLAYER 18 HAS ESTABLISHED CONTACT WITH AN UNREGISTERED NETWORK.
Then:
NEW OBJECTIVE: IDENTIFY ALL ASSOCIATED PLAYERS.
Chen Rui read it.
His face went pale.
"They've found us."
Lin Xia looked at the twenty-three names on the network screen.
"No," she said.
She picked up the red notebook.
"They've found out we're looking."
She turned toward the stairs.
"Now we make sure everyone else knows what they're doing."
And for the first time since entering XO Project, Lin Xia wasn't thinking about how to win the next game.
She was thinking about how to make the game answer for what it had already done.