Before they went to the tutoring center, Lãnh Phong made Minh stop at Hạ Yên's office.
Minh hated the detour because every minute felt like a door closing somewhere else. Lãnh Phong did not explain himself in the elevator. He only watched the floor numbers climb with the expression of a man counting which mistake had already happened and which one could still be interrupted.
Hạ Yên's office looked untouched.
That was how Minh knew someone had been inside.
Real absence was messy. A cup left wrong. A chair turned. Papers interrupted mid-thought. Hạ Yên's room was too clean, the kind of clean created by a person who knew what disorder investigators trusted.
Lãnh Phong stood by the desk and did not touch anything.
Minh had never seen him that still.
On the monitor, Dataset 06 remained locked.
Beside it sat Thanh Lạp Ty's card.
One sticky note had been peeled from the corner and replaced badly. Minh saw the faint square where dust had not settled yet.
"She would have noticed," he said.
"She did."
Lãnh Phong pointed to the trash bin.
Inside, folded beneath a tea packet, was a receipt from a medical transport service.
No patient name.
Wrong district.
Correct time.
Minh's pulse climbed.
Gomboc offered a simple solution:
"Find driver. Break driver."
Thiên Phú offered another:
"Trace route. Preserve evidence."
Minh crouched and photographed the receipt before touching it.
Lãnh Phong looked at him once.
Not praise.
Recognition.
That almost hurt more.
His phone buzzed.
Thuận:
We found the exchange health-screening storage address. Closed tutoring center, attached rehab annex. Too clean.
Another message followed.
I am delayed. Senior found.
Minh stared at the words.
"Thuận found his guide."
Lãnh Phong's mouth tightened. "Bad timing."
"Or good?"
"Both usually means trap."
At the same moment, Lâm sent a photo.
The old tournament poster turned over, covered in route lines, timestamps, and three circled locations.
Under it:
If Hạ Yên moved by paperwork, the clinic threat was cover. The tutoring center is the only point touching all routes.
Minh read it twice.
Lâm was not in the fight.
Still, his hand had drawn the map.
Lãnh Phong took the phone, studied the image, then handed it back.
"He should not come."
"He knows."
"Good."
Minh looked toward the dark window.
For once, that word did not mean safe.
It meant the trap had fewer handles.
Somewhere beyond the city lights, a clean room had already swallowed Hạ Yên.
And Hạ Yên, who always answered before anyone finished asking, remained silent.
Hạ Yên's room had the wrong kind of order.
Minh knew disorder with life in it: cups left beside notes, medicine wrappers half-folded, books opened face-down because she intended to return, the quiet arrogance of a person who trusted her own mess.
This was not that.
The desk had been cleaned by someone imitating cleanliness. Papers aligned too squarely. Chair pushed in too far. Trash removed. Laptop gone. One cabinet door closed without catching because whoever closed it did not know the hinge usually stuck.
Minh stood in the doorway and felt panic ask for permission.
Lãnh Phong would have said panic was information arriving loudly. Minh tried to listen beneath the volume.
A faint chemical smell remained near the sink. Not strong. Not enough for police, if police were even useful here. Beside the plug was a thin half-moon mark where a glass vial had rested too long. Hạ Yên would have wiped that if she had left by choice.
Lâm's voice came through the phone, steadier than Minh deserved.
"Window?"
"Locked."
"Bag?"
"Gone."
"Voluntary bag or taken bag?"
Minh looked at the shelf. One strap from her old canvas bag hung caught behind a drawer handle, torn clean.
"Taken," he said.
Silence answered.
Then Lâm exhaled.
"Then don't run where your fear points first. Tell me everything in the room."
Minh closed his eyes for one breath. When he opened them, the room became evidence instead of loss.
Minh described the room until his voice stopped shaking. That was not bravery. It was obedience to a better instinct than panic. Somewhere in the description, Hạ Yên changed from missing person to trail, and a trail could still be followed.
The room still felt like her after the search began. That made it crueler. Her absence had not erased her. It had turned every familiar object into a witness too scared to speak.
The torn strap told Minh more than the missing laptop.
Hạ Yên loved that bag because it looked useless. Old canvas. Faded seam. A small stain from coffee she never admitted spilling. It was the kind of object people underestimated, which meant it had carried medicine, drives, and guilt through more dangerous rooms than most people entered in a lifetime.
She would not leave it torn.
Minh took a photo before touching anything. He had started hating how often evidence came before emotion, but hatred did not make the order wrong.
In the bathroom, one tile near the sink was wet though the rest had dried. He crouched and smelled antiseptic beneath the detergent. Someone had wiped too fast. The drain held one dark thread, too short to identify, long enough to prove struggle had occupied even small places.
"Minh," Lâm said through the phone.
"I'm here."
"No. You're going quiet."
Minh noticed his breathing then. Too shallow. Too even. The kind of control that came right before breaking because it was built from force instead of balance.
"Describe the room," Lâm repeated.
So Minh described. The drawer. The strap. The wet tile. The stuck hinge closed correctly. The missing old phone charger Hạ Yên always forgot to unplug. Detail by detail, the room became less like a grave and more like a path.
Lâm listened without interrupting.
For once, the injured boy was the one holding Minh upright.
When Minh finished describing the room, Lâm asked him to repeat the first three details again. Not because he had missed them. Because repetition revealed what panic changed. The drawer was still too neat. The strap was still torn. The tile was still wet. Truth survived the second telling. That meant they could build from it.
Before leaving the room, Minh took one last photo from the hallway. It showed the whole space at once: order, absence, evidence, fear. Later, when memory tried to exaggerate or soften details, that photo would keep the first truth intact.