Seung-min stopped sitting down immediately.
That was the first change.
It wasn't intentional. Nothing in him had decided it.
It was only that, for a moment—just a fraction of time he could not explain—he found himself standing beside his chair instead of occupying it.
As if waiting.
As if something was supposed to arrive first before he did.
Then he sat down anyway.
Slowly.
Carefully.
Like correcting a mistake that had no visible shape.
Youn-jun arrived five minutes later.
Not late enough for anyone else to notice.
But Seung-min did.
He always did.
The door slid open with the familiar soft scrape, and Youn-jun stepped in with his bag hanging loosely off one shoulder. His hair was slightly messy, like he had rushed or forgotten to fix it properly.
He paused at the entrance.
His eyes scanned the room.
And for a brief second—so brief it almost didn't exist—they landed on Seung-min.
Something flickered there.
Not warmth exactly.
Not distance either.
Something in between, like hesitation that didn't know where to go.
Then Youn-jun smiled.
Small. Automatic.
And turned away.
He didn't sit next to him.
He had been sitting next to him for years.
Seung-min understood that fact with the same clarity one understood gravity. It was not something that changed without consequence.
But today, Youn-jun sat two desks away.
Beside Hana.
Seung-min noticed the exact moment it happened.
The chair dragging slightly.
The soft greeting.
The way Youn-jun adjusted his position—not to face Seung-min, but to face outward.
Like he had chosen a different direction without announcing it.
Seung-min opened his notebook.
Wrote nothing.
Closed it again.
Opened it again.
The page stayed blank longer than it should have.
At lunch, the cafeteria was louder than usual.
Noise layered over noise. Trays clattering, laughter spilling, chairs scraping against tiles.
Seung-min sat in his usual place.
He did not move it.
That was important, he told himself.
If something changed, it should not be him who moved first.
Youn-jun appeared ten minutes later.
Not alone.
Dae-hyun was talking beside him, animated, hands moving as he spoke. Youn-jun listened, nodding occasionally, smiling at the right moments.
He looked… normal.
That was the strange part.
Completely normal.
Like nothing had shifted at all.
Like Seung-min had imagined the emptiness in the mornings.
Youn-jun glanced around the room.
His eyes passed over Seung-min.
Then returned for half a second longer than necessary.
A pause.
A recognition.
And then—
He waved.
Just once.
Casual.
Friendly.
From distance.
Seung-min didn't wave back immediately.
His hand lifted only after a delay that no one would notice unless they were looking for it.
Youn-jun had already turned away.
The message came during the third period.
Seung-min felt his phone vibrate once inside his pocket.
He did not check it immediately.
That was not because he was disciplined.
It was because he already knew.
He knew before he looked.
When he finally opened it, the screen lit softly against his fingers.
Youn-jun:
"Sorry, I might not be able to go up to the rooftop today. Got club stuff after school."
No emoji.
No extra words.
Just a statement.
Clean.
Final in a way it didn't need to be.
Seung-min stared at it for a long time.
Long enough that the screen dimmed.
Then lit again when he touched it without realizing.
He did not reply immediately.
Not because he didn't want to.
But because there was nothing in the message that required a reply.
And that… felt unfamiliar.
The rooftop was empty after school.
The wind was colder than usual.
Seung-min stood where they usually stood.
The exact spot Youn-jun usually leaned against.
The exact angle of light where Youn-jun's hair used to catch gold in late afternoon.
Everything was unchanged.
Except him.
He looked at the vending machine in the corner.
Still there.
Still humming faintly.
He remembered Youn-jun pressing his forehead against it once and laughing because it was "too cold."
Seung-min had said it was inefficient behavior.
Youn-jun had called him heartless.
Seung-min had not corrected him.
Now there was no laughter.
Only wind.
Seung-min pulled out his phone again.
No new messages.
He stared at the empty notification space like it might fill itself if he waited long enough.
It didn't.
He typed:
"Are you busy today?"
Stopped.
Deleted it.
Typed again:
"Did something happen?"
Deleted.
Again:
"When are you coming?"
His thumb paused.
And then he didn't send it.
He locked the phone instead.
As if silence could be made cleaner by closing it.
Below the rooftop, the school courtyard slowly emptied.
Students leaving in groups.
Voices fading.
Lives continuing.
Seung-min stayed where he was longer than necessary.
Not because he expected anything.
But because leaving would confirm something he didn't want to name yet.
When he finally turned to go, he noticed something small.
A milk carton.
Left near the rooftop stairs.
Unopened.
Straw still attached.
For a moment, he froze.
Then picked it up.
Cold against his fingers.
Familiar in a way that made his chest tighten quietly.
Youn-jun must have been here earlier.
He must have come.
He must have stayed long enough to leave this behind.
And still not stayed long enough to wait for him.
Seung-min held the carton longer than necessary.
Then slowly placed it in his bag.
Like keeping something that had already started disappearing.
That night, his phone lit up once.
A notification.
Youn-jun:
"Sorry I missed rooftop today."
No explanation.
No continuation.
Just absence, acknowledged too late.
Seung-min stared at it in the dark.
His room was quiet enough to hear the clock.
He did not reply.
Not because he was angry.
Not because he was indifferent.
But because for the first time—
He wasn't sure what reply would keep things from moving further away.
And somewhere in that silence,
he began to understand something he didn't yet have words for.
Not loss.
Not distance.
Something softer.
And far more dangerous.
Because it was still there.
Just… no longer reaching back.