By the time Lin Wuchen reached Gu Yan's courtyard, his wrists hurt more than his lungs ever had in ruin smoke.
Pain in the wrist was a different kind of warning. It meant your hands were being tested, not your courage.
Wei opened the gate before Wuchen even knelt. His eyes went straight to the lacquer box.
"Set it down," Wei said.
Wuchen carried it to the pavilion table and placed it carefully, both hands steady, not letting the lid knock wood. The paper tag with Lan's mark swung once, then stilled.
Gu Yan was seated, calm, lamp light catching his eyes. He didn't greet Wuchen. He greeted the box.
"You brought it," Gu Yan said softly.
Wuchen knelt. "Yes."
Gu Yan didn't touch it immediately. "Did anyone see you carrying it?" he asked.
Wuchen's throat tightened. "Yes."
Gu Yan's smile widened faintly. "Good," he murmured. "Did anyone touch it?"
Wuchen bowed lower. "No."
Gu Yan's eyes brightened. "Then you learned," he said.
Wei reached for the lid, but Gu Yan lifted a finger. "Not yet," Gu Yan said.
He looked at Wuchen. "Tell me what happened on the way," he said gently.
Wuchen reported cleanly: the follower's distance, the reflection in lantern glass, the service courtyard, the broken jar, the servants' eyes, the ridge-mark token at the follower's belt.
Gu Yan listened like a man listening to rainfall, not surprised by any of it.
When Wuchen finished, Gu Yan asked quietly, "Did he give a name?"
Wuchen shook his head. "No."
Gu Yan nodded once. "Then he wasn't important," he said. "Only useful."
Wei spoke from the side, voice flat. "Useful to Lan or useful to Han."
Gu Yan smiled faintly. "Or useful to someone who wants both of us bleeding," he said.
Wuchen's stomach tightened.
Gu Yan finally touched the lacquer box. His fingers traced Lan's mark on the hanging tag, almost polite.
Then he broke the latch cleanly and opened the lid.
Inside were dozens of thin wooden tags, some stained dark with old blood, each carved with small characters and crude marks. Entry stamps. Team numbers. Dates that didn't match this season. The smell was dry and old.
Gu Yan lifted one tag and held it to the lamp. His eyes moved across the carving.
Then he lifted another.
And another.
He wasn't reading them like a curious man.
He was counting patterns.
Wei leaned in, eyes sharp.
Gu Yan's smile grew thinner. "Lan keeps good records," he murmured. "She also keeps… gaps."
Wuchen's throat tightened. "Gaps?"
Gu Yan glanced at him, amused. "A record with no gaps is a lie," he said. "The question is what she chose to hide."
He set the tag down and reached into his sleeve, pulling out the copied ruin names sheet Qiao had made earlier. He laid it beside the open box.
Then he began matching.
Tag marks to names.
Team stamps to corridors.
Entry habits to handwriting.
Wuchen watched, silent.
He saw one name appear again and again, paired with different team tags as if it traveled across groups like a disease.
Gu Yan's finger stopped on that name.
His eyes brightened.
"Ah," Gu Yan murmured.
Wei's gaze sharpened. "What?"
Gu Yan didn't answer Wei immediately.
He lifted the tag and asked Wuchen softly, "Do you remember the corridor shadow with the ridge-mark token?"
Wuchen's stomach tightened. "Yes."
Gu Yan held the tag up. "This mark," he said gently, "belongs to the Ridge Patrol line."
Wei's jaw tightened.
Gu Yan smiled. "So our shadow wasn't Lan's," he murmured. "It was a patrol boy with permission to walk anywhere."
Wuchen's throat went dry.
That meant the follower could be in any corridor without raising suspicion.
It also meant he could report to elders, not inner disciples.
Gu Yan set the tag down and closed the box lid slowly. "We return it," he said.
Wei frowned. "Now?"
Gu Yan nodded. "Now," he said softly. "Before Lan notices it was opened."
Wuchen's stomach tightened. "Senior Brother… she'll check."
Gu Yan smiled. "Let her," he murmured. "Her checking is part of the story."
He slid the box toward Wuchen. "You will return it," he said. "And you will walk the same route."
Wuchen's breath tightened. "So the shadow follows again."
Gu Yan's eyes brightened. "If he follows," he said, "we confirm he's Ridge Patrol."
Wei added quietly, "And if he touches it this time, we cut his hand."
Gu Yan's smile stayed. "Not you," he said to Wei. Then his gaze returned to Wuchen.
"You," Gu Yan said gently. "You will make him touch it."
Wuchen's stomach dropped.
Gu Yan leaned forward slightly, voice soft as a blade. "A runner carrying a box is boring," he murmured. "A runner who looks like he's about to drop a box makes hands reach."
Wuchen swallowed.
Gu Yan's eyes stayed bright. "Don't worry," he said. "You won't really drop it. You'll only make him think you might."
Wuchen bowed, throat dry. "Understood."
Gu Yan tapped the table once. "And when he reaches," he said, "you will step aside so the servants see his fingers on Lan's mark."
Wuchen felt cold slide into his chest.
He had survived beasts and smoke and men with knives.
Now he was being trained to set traps with nothing but a wobble of his wrists and the timing of a spill.
Gu Yan stood and handed Wuchen the lacquer box.
"Return it," he said softly. "Bring me a name."
Wuchen bowed and lifted the box again, wrists aching, heart steady by force.
As he stepped out of the courtyard, he understood the newest lesson.
In the outer yard, you learned to endure humiliation.
In the inner hall, you learned to manufacture it for other people.