Spring rain had become part of Hangzhou's routine.
It arrived before dawn, settled over the city without urgency, and lingered well into the morning as though reluctant to leave. By the time the first lecture began, the red-brick walkways of the university glistened beneath a thin layer of water. Fresh leaves, washed clean overnight, stirred gently whenever the wind drifted through the campus.
Students crossed the courtyards in loose clusters, umbrellas weaving around one another with practiced ease. Some balanced paper cups of soy milk while finishing breakfast on the move. Others hurried with notebooks tucked beneath their jackets, choosing speed over staying dry.
No one looked particularly awake.
The bell rang.
Not that anyone rushed because of it.
By the time Professor Liang entered Lecture Hall Three, half the class had already taken their seats. The other half arrived in ones and twos, slipping quietly through the rear doors with the confidence of people who knew exactly how late they could be without being noticed.
Professor Liang placed his worn leather briefcase on the lectern and surveyed the room over the rim of his glasses.
No conversation stopped.
It never did.
He smiled to himself.
Thirty years of teaching had convinced him that university students possessed an extraordinary talent for ignoring authority until authority began writing examination papers.
He connected his laptop to the projector.
The screen flickered to life.
"Good morning."
The response came back in uneven fragments.
Some answered.
Most didn't.
"Today," Professor Liang said, adjusting his glasses, "we'll continue our discussion on bioelectrical signaling and neural interfaces."
A sigh travelled across the lecture hall.
It wasn't loud.
More like several dozen people silently reaching the same conclusion at once.
Professor Liang pretended not to hear it.
He had heard far worse.
"Before we begin..."
He looked around the room.
"Can anyone explain why action potentials remain unidirectional despite ions moving in both directions across the membrane?"
Silence.
Not uncomfortable, simply academic.
Students lowered their eyes to notebooks that suddenly seemed fascinating.
A few studied the ceiling with remarkable concentration.
Near the middle of the lecture hall, a calm voice answered before Professor Liang repeated the question.
"The refractory period temporarily inactivates sodium channels after depolarization, preventing the impulse from travelling backwards."
The explanation ended as evenly as it had begun.
Yè Yī never looked up from his laptop, nor did he unplug the earpiece from his ears.
His fingers continued moving across the keyboard while he spoke, as though answering questions required no more effort than breathing.
Professor Liang nodded once.
"Correct."
There was no surprise in his voice.
Only confirmation.
The lecture continued.
Several students exchanged resigned glances.
Someone near the back whispered,
"I don't think he's ever actually attended class."
"He attends."
"He just doesn't seem emotionally involved."
"Does he get emotionally involved with anything?"
"I saw someone ask him that once."
"What happened?"
"He answered."
"...And?"
"That was it."
A few quiet laughs spread through the back row before disappearing beneath Professor Liang's voice.
Three seats away, Qiū Huà Bǐ rested one elbow against the desk.
His notebook lay open.
The page contained exactly six lines of notes.
Each was neat and accurate.
But it didn't suggest he was enjoying himself.
His pencil stopped moving.
He stared at the sentence he'd just written.
Then added three words beneath it.
Still unnecessarily complicated.
He looked at it for a moment.
Nodded almost imperceptibly.
'Satisfied.'
The seat beside him remained empty.
Not because anyone had reserved it.
Nobody ever had.
During their first semester, classmates occasionally tried sitting there.
The attempts never lasted.
Qiū Huà Bǐ wasn't rude.
He simply never acknowledged conversation unless it served a purpose.
Eventually people stopped trying.
The empty seat became another quiet habit of the classroom.
Yè Yī's side of the lecture hall had developed a similar habit.
Students didn't avoid him out of fear or admiration.
Over time they had simply discovered that silence occupied less effort than unsuccessful small talk.
Neither young man minded.
Neither noticed.
Professor Liang changed the slide.
A diagram of neural pathways appeared across the projector screen.
"If the human brain can be understood as an information network..."
He clicked again.
"...then the possibility of direct biological interfacing becomes—"
The projector froze.
Its cooling fan hummed once.
The image dissolved.
Not into static but geometry.
Thin white lines folded across the projection in precise angles that refused to resemble any diagram Professor Liang had prepared. Symbols emerged between them, shifting with quiet purpose across a black background. They belonged to no written language anyone in the room could have identified.
At the centre of the pattern...
a single crimson point pulsed slowly.
Almost like breathing.
Half a heartbeat later—
The classroom returned.
Neural pathways. Blue arrows. PowerPoint.
Professor Liang frowned briefly at the projector.
"Maintenance really needs to replace this thing."
Several students chuckled.
Someone blamed the university budget.
The lecture moved on.
No one thought about it again except two people.
Qiū Huà Bǐ's pencil hovered above the page.
The muscles behind his left ear tightened unexpectedly.
It wasn't pain.
More like the instinctive sensation of turning when someone called your name—
except no sound had reached him.
The feeling travelled lightly down his spine before fading completely.
He frowned.
'Strange.'
Beside him, Yè Yī had already memorized every symbol, every angle, the position of the red point.
He closed the document on his laptop and opened another without changing expression.
Questions without enough information rarely deserved immediate attention.
If the phenomenon mattered...
it would happen again.
If it didn't...
thinking about it achieved nothing.
A soft knock interrupted his thoughts.
Qiū Huà Bǐ's pencil rolled from the edge of his desk.
It bounced once, twice, then disappeared beneath the row of seats.
"...Great."
He leaned down to retrieve it.
Without looking away from the equations on his screen, Yè Yī spoke.
"You're not the only one."
Qiū Huà Bǐ paused halfway beneath the desk.
"What?"
"The projector."
Nothing more.
No explanation or attempt at conversation.
Just information.
Qiū Huà Bǐ straightened slowly, pencil still in hand.
He looked toward Yè Yī.
For the first time all semester, their eyes met.
Neither smiled.
Neither nodded.
Neither seemed particularly interested in extending the exchange.
Qiū Huà Bǐ considered asking another question.
There wasn't enough information to justify one.
He looked away.
So did Yè Yī.
The lecture resumed as though nothing had happened.
Outside, the rain continued washing over Hangzhou.
Students hurried between buildings.
Cyclists rang their bells along wet stone paths.
Somewhere across campus, a groundskeeper swept fallen leaves into neat piles, only for the wind to scatter them again.
Life continued with quiet determination.
Far beyond the university...
beyond the city...
beyond anything either young man could have imagined...
something observed the silence it had just encountered.
Its search had touched Hangzhou for less than a second.
It found two minds that noticed.
Neither answered nor awakened.
The signal withdrew for now.
Neither Yè Yī nor Qiū Huà Bǐ realized that this ordinary spring morning would eventually become impossible to forget.
Not because of what happened, but because of what almost did.