The black point on the wall was not a passing phenomenon.
Yun understood that immediately from the way his grandfather's expression changed. He didn't raise his voice, nor did he look panicked, but the sudden firmness in his eyes was enough to tell Yun that this was far more serious than it appeared. Beside him, Serna stood ready, her shoulders tense, her breathing slower than usual, as if she was holding herself back until she could understand what was about to emerge.
As for Yun, he remained still for a moment, but his thoughts were anything but steady. He could feel the pulse in his chest clearly, not chaotic like before, but sharp, controlled, and deliberate, as if something inside him had awakened in response to something beyond the walls.
The black point expanded slightly.
It wasn't a hole, and it wasn't a normal crack. It looked like a patch of darkness denser than darkness itself, swallowing light instead of reflecting it. It spread slowly across the metallic wall, and the thin blue lines surrounding the chamber began to dim one after another until half the room was covered in a faint, unstable glow.
No one moves, the old man said in a low but sharp voice, not until I understand the nature of this intrusion.
Serna turned to him quickly. An intrusion, so something actually reached the outer layer of the hideout.
He didn't answer her directly. Instead, he stepped forward with measured movements and raised his hand toward the wall without touching it. Thin circles of light formed in the air, spinning around his wrist before connecting to the surface, as if trying to read what lay beneath.
Yun watched in silence. He didn't understand everything his grandfather was doing, but one thing was clear. Whatever had appeared on that wall was not normal, and it was not a simple system malfunction.
After a few seconds that felt longer than they should have, the old man spoke.
This isn't a direct attack.
Serna narrowed her eyes. Then what is it.
It's searching.
The word landed heavier inside Yun than it did in the room.
Searching.
For what.
Or for who.
He didn't need to ask. At that exact moment, his grandfather's gaze aligned with the surge in his chest. No words were spoken, but Yun understood, or rather, he felt it before allowing himself to accept it.
That thing wasn't striking the wall randomly.
It was probing.
Tracing something.
And the first thing that responded was him.
Serna stepped forward. Should I cut it off.
No. The answer came instantly. If we strike before we understand it, we might give it exactly what it wants.
She remained silent, but her hand slowly moved toward the short blade at her waist.
Yun didn't notice.
His eyes were locked onto the expanding darkness, now the size of a clenched fist. Then, for the first time, he saw something move inside it.
It wasn't a full form.
Just a distortion.
Something like the tip of fingers, or a strand of dense smoke shaped into something alive. It appeared for a moment, then withdrew, then returned to touch the edge of the opening as if testing it.
The instant it did, the pulse in Yun's chest surged violently, forcing a sharp breath out of him.
Serna turned immediately. Yun.
He pressed his hand against his chest, forcing himself to stay steady.
It's responding to me.
A faint light passed through his grandfather's eyes, but he showed no surprise.
As expected.
He raised his other hand, and the light patterns shifted, forming more complex intersections. The entire chamber trembled slightly, and thin strands of energy shot upward from the floor, surrounding the black opening from all sides.
A faint sound filled the room, something like distant metal grinding against itself.
Then the opening contracted.
It pulled back.
It trembled.
For a brief moment, it seemed to resist.
But the light tightened around it, and with one final pulse from the wall, it closed.
The blue lines slowly regained their brightness.
Silence returned.
Heavy.
Uncomfortable.
The kind of silence that comes after surviving something you didn't fully understand.
The old man lowered his hand.
Is it over, Serna asked.
For now.
Yun stepped forward slightly. What was that.
His grandfather turned toward him slowly. Not something simple.
I know that.
No. His voice sharpened slightly. You don't.
A brief silence followed.
What appeared was not a body, not a full passage. It was an extension, a trace, something testing the path. It hasn't entered yet, but it knows the direction.
Yun's hand was still on his chest.
Because it felt me.
Yes.
The old man didn't soften the truth.
That means staying here isn't safe anymore, Serna said.
The old man glanced at her, then back at Yun.
That means your training can no longer remain theoretical.
Yun felt the exhaustion from everything, the Warrior Machine, the man in the cave, and now this. And yet beneath that exhaustion there was something else.
Clarity.
Everything that happened didn't calm him, it sharpened him.
What do I do now, Yun asked.
Return to your normal life.
Yun blinked. What.
You go to school tomorrow, finish your week, act like nothing happened.
Serna frowned. That's risky.
It's necessary. If he hides, he becomes a clearer target. If he returns to normal, we gain time.
Yun didn't like it, but he understood.
You will not treat this as over, the old man added. From now on, you observe everything. Every pulse, every shift, every change.
And if you feel it again, don't ignore it.
Yun nodded.
The next morning felt disturbingly normal.
Students filled the halls, complaining, laughing, moving without concern. Teachers walked from class to class as if nothing beneath the surface of the world had changed.
Yun sat in his usual seat, his notebook open, writing only occasionally. Part of his attention followed the lesson, the rest remained on the pulse.
Quiet.
Too quiet.
Creighton leaned back in his chair beside him.
You look better than yesterday, but not in a way I trust.
Yun glanced at him. That's a strange sentence.
You've become strange.
Yun didn't respond.
Sharma sat in front of them, quieter than usual. He only looked back once, but that was enough.
Something had changed between them.
Something unspoken.
The classes dragged on, then suddenly ended as the final bell rang. Students rushed out as if escaping confinement.
Finally, a full week, Creighton said, laughing.
You've been counting, Yun asked.
Of course.
Sharma approached them, glancing around briefly.
Are we still going.
Thought you'd back out, Creighton said.
I didn't.
Sharma looked directly at Yun.
We leave tomorrow. Somewhere quiet. Outside the city.
Yun didn't hesitate.
I'm in.
Creighton grinned. Good. Finally a real break.
But Yun wasn't thinking about rest.
A quiet place near the forest was not just an escape.
It was an opportunity.
Far from the city, Rinma and Mark stood before Lucius once more.
The hall was silent.
Too silent.
You were punished, Lucius said.
Neither responded.
That is enough for now.
There is something I need.
With a gesture, a projection appeared, a river flowing through dense forest, its color shifting between silver and blue.
A hidden river deep within the forest.
What makes it special, Mark asked.
It feeds the body with energy. Those who touch it may grow stronger. Those who misuse it may break.
You want us to find it, Rinma said.
No. I want you to bring it to me.
This is not mercy. It is a chance.
Understood.
That night, Yun stood by his window.
The sky darkened slowly.
Tomorrow.
His hand rested on his chest.
The pulse responded.
Soft.
Measured.
If you want me to listen, then start speaking.
Nothing answered.
Deep within the forest, water flowed slowly between dark stones.
Calm on the surface.
Alive beneath.
Something moved below.
Not a fish.
Not a shadow.
Something watching.
And somewhere nearby, a figure stood between the trees.
Watching the water.
Or what lived within it.
Then it lifted its head slightly.
And at that exact moment, the surface of the river trembled.
Not from the wind.
But as if the river itself had awakened.