Thuận found the old contact on the upper floor of a shuttered Vovinam studio near Xuân Hòa.
It was a few streets from Lê Quý Đôn, but it was not the disused campus gym Lao had commandeered. This was an old martial-arts training floor with its own history.
The man was thin, gray-haired, and cleaning a wooden floor no students had touched in years.
The studio still carried old pride in its walls. Faded certificates hung beside a cracked mirror. A rolled banner leaned in the corner, its red letters sun-bleached into brown. Outside, scooters passed without slowing, and the building looked like another forgotten rental above another closed business.
Near the doorway, a pair of straw sandals sat with their toes facing out. Thuận noticed because Senior had once slapped his ankle for leaving shoes pointed inward.
"A room remembers how you enter," Senior had said. "If you rush through a threshold, you will rush through a choice."
"Senior sent you?" Thuận asked.
"If he wanted you sent, you would already know where he is."
Thuận accepted the correction.
Tân Phong waited by the stairs. Tân Thành stayed outside, broad enough to discourage curiosity.
The old man looked at Thuận's stance.
"You saw the sandals."
Thuận's eyes moved back to the doorway.
"Lục Hoa keeps small rules," the old man said. "Shoes out. Floor swept. Tea poured for the person who leaves last. Not because manners save lives. Because a boy who cannot control small habits will call large restraint philosophy and fail at both."
"He taught you the Bloom."
"Only a branch."
"Enough to make people greedy."
Thuận did not answer.
The word Bloom sat heavily between them. Thuận had never liked saying technique names aloud. Names made boys hungry. Names made them imagine shortcuts. The senior who taught him had called the art a responsibility before he ever called it power.
The man set the cloth aside. "Your senior warned you about star readers?"
Thuận's eyes sharpened.
"Huyền Tinh?"
"Students call everything gangs now. Rival schools. Private-school arrogance. Boys with money and bored hands." The old man smiled without humor. "Useful cover."
"Are they tied to Ernest Thälmann?"
"They tie themselves to anything with ambition."
Tân Phong stepped closer. "What do they want?"
"Charts."
The answer sounded absurd.
The old man continued. "Huyền Tinh does not fight first. They observe. Breath, injury, fear, loyalty. A person is a constellation to them. Touch the right point, the whole sky moves."
Tân Phong muttered, "Sounds like cowards."
"Cowards still win if brave boys keep charging where they are pointed."
That shut him up.
Thuận thought of Minh receiving the photo. Lâm's hand. Quân's silence.
"And the pills?"
The old man's face changed.
"Cheap gates for desperate boys. They sell the dream of power, then watch who survives the poison."
Tân Thành's fists tightened outside the doorframe.
"And the ones who survive?" Thuận asked.
"Debts. Blackmail. Recruitment. Sometimes all three."
Thuận asked quietly, "Was Lao one of theirs?"
"Lao was useful because he believed the lie harder than the sellers did."
That struck deeper than expected.
Predator.
Tool.
Both could be true.
Thuận remembered Lao's smile when weaker boys lowered their heads. He had thought it was confidence once. Later, he understood it was hunger pretending to be law. If Huyền Tinh had met him earlier, they would not have needed to change much. Only give the hunger a map.
Before leaving, Thuận bowed.
"Where is Senior?"
The old man picked up the cloth again.
"Still running from the door he built."
On the stairwell wall, Tân Phong found a mark scratched into old paint.
A hanging star.
Fresh.
Thuận photographed the fresh mark and did not touch it.
Tân Thành leaned close enough for his breath to disturb the dust. "A flower under a star. Is that an insult?"
"It is a sequence," Tân Phong said. He held his phone beside the wall without using the flash. The older flower mark had been cut into paint years ago. The hanging star crossed it with a cleaner blade. "Someone found the place after Hạo Nhiên left."
The room above the closed Vovinam floor smelled of old mats and rain trapped in wood. Hạo Nhiên had once used it to teach them how to fall without dragging another person down. He had vanished before explaining why those lessons came with rules about witnesses, doors, and people who asked too many questions.
Thuận searched the room without turning it into a crime scene. Under a warped floorboard he found six coins wrapped in cloth. Their positions formed an unfinished circle. One space remained empty.
Tân Thành reached for the gap. Thuận caught his wrist.
"He left it empty for a reason."
"Maybe the reason was that he lost a coin."
Tân Phong almost smiled. "That would be the most irritating explanation."
On the cloth, one corner carried a bus-route number written in faded ink. Thuận knew the route. It passed neither his school nor Minh's. It ended near an old herbal wholesale lane where Hạo Nhiên used to buy liniment after training.
The carved star changed the choice. Following immediately might lead Huyền Tinh to the same door. Waiting might let the trail cool.
Thuận wrapped the coins exactly as he had found them. "We leave separately. Nobody goes to the route tonight."
Tân Thành frowned. "And tomorrow?"
"Tomorrow we see whether the star expects us to be impatient."
For the first time, Thuận treated restraint not as Hạo Nhiên's rule but as his own decision.
Before leaving, Thuận photographed the empty coin position rather than the coins themselves. A complete set would invite someone to count possessions. The absence recorded a principle.
At home, he put one coin beneath each leg of a crooked study desk. The surface became level, but the arrangement broke the circle. He studied over it anyway, learning that preserving a teaching did not require turning every object into a shrine.
One coin remained in his pocket during the evening meal. Each time Thuận shifted, it pressed against his leg, a small reminder that following Hạo Nhiên would require leaving other positions unsupported.