The Qingyun Sect physician arrived nine days later in the unassuming form of a thin, silver-haired woman named Physician Mei, dispatched at Ji Chen's written request and Elder Bai Rong's personal authorization, carrying a lacquered case of needles and an expression of professional neutrality that lasted exactly as long as it took her to examine Yan Zhao's pulse points.

"How long," she said, low, to Ji Chen rather than to the prince himself, "has His Highness experienced this particular tremor pattern after exertion?"

"Since the injury," Yan Zhao said, before Ji Chen could answer for him. He had submitted to this examination on the condition that he would not be discussed over his own head like a horse at market, and he intended to hold that condition regardless of how uncomfortable the examination itself proved to be. "Eight months."

Physician Mei's fingers moved along his wrist, then to a point at the base of his skull that made his vision swim faintly white at the edges when she pressed it, then to three points along his spine that no palace physician had ever once examined in eight months of treatment.

"This is not a fall injury," she said finally, setting down her instruments with the precise, controlled motion of a woman keeping her hands steady through sheer professional discipline rather than calm. "A fall injury presents as trauma, torn pathways, scarring along a single point of impact, degradation that does not spread evenly outward over time. 

This…" she gestured, encompassing the whole pattern of his body with one motion “…this is systemic. Slow. Spreading from the core outward in a manner consistent with prolonged exposure to a neurotoxin, administered over an extended period rather than in a single dose."

The room went very still.

"You're certain," Yan Zhao said. His voice came out steadier than he felt.

"I am certain enough to stake my standing in Qingyun Sect on it, Your Highness, which is not a wager I make lightly." Physician Mei's eyes were sharp, careful, watching his face for the reaction she clearly expected and that he refused, with every ounce of discipline left in him, to give her. "I would need to run further tests including blood, qi-pulse mapping over several days, comparison against the known toxin registries our sect maintains, before I could name the specific poison with confidence. But a hunting accident does not produce this pattern. I would stake my life on that much without need for further tests at all."

Yan Zhao sat very still in his chair, hands folded in his lap atop legs that had betrayed him for eight months for reasons that were, apparently, never an accident at all, and felt something in his chest go cold and very, very quiet.

Someone did this to me.

Someone has been doing this to me, slowly, deliberately, for longer than eight months, and I let myself believe it was an accident, because the alternative meant admitting that someone in my own court — someone close enough to administer a poison over time without detection — wanted me silenced badly enough to take everything from me rather than simply ending my life outright.

"Who," he said, very quietly, "has access to administer something over an extended period without detection."

"That," Physician Mei said, "is precisely the question I imagine your husband intends to spend a great deal of effort answering, Your Highness, given the look on his face right now."

Yan Zhao turned. Ji Chen stood by the window, arms crossed, expression gone hard and focused in a way Yan Zhao hadn't seen on him before, not the easy warmth, not the careful diplomatic mask, but something colder and more dangerous underneath both, the look of a soldier who has just identified an enemy and begun, silently, calculating how to end them.

"Don't," Yan Zhao said, as if understanding that look. 

Ji Chen's eyes snapped to his and said, "Don't what."

"Don't decide this is your battle to fight on my behalf. I have survived eight months as a cripple in a court full of people who pity me. I do not need a husband appointing himself my personal avenger before we have even confirmed what we're dealing with."

"I'm not appointing myself anything." Ji Chen's voice was quiet, level, and underneath it ran a thread of something that sounded, for the first time since their wedding night, almost like anger — not at Yan Zhao, but on his behalf. "Someone has been poisoning my husband for over a year, slowly, carefully, in a way specifically designed to look like an accident no one would think to question. That makes it my battle whether you grant me permission or not, the same way it would be my battle if someone tried to poison my sword arm before a duel. I don't need your permission to refuse to let that go unanswered. I would simply prefer to have it, because I think we'll find the answer faster fighting this together than with you trying to handle it alone out of some idea that needing help makes you weak."

The room was silent except for the faint rustle of Physician Mei discreetly gathering her instruments, the diplomatic retreat of a woman who recognized a conversation that had stopped being about medicine.

Yan Zhao looked at his husband, really looked, past the warmth, past the easy court manners, at the steady, unflinching fury underneath, fury that had apparently been kindled entirely on his behalf in the space of a single revelation and felt something crack, very slightly, in the careful architecture of distance he had built around himself for eight months.

"We tell no one," he said finally, low. "Not my father, not the court, not even Jiang Wu beyond what he needs to know to keep us both alive. Whoever did this believed they had succeeded completely. I would prefer they continue believing that, while we determine exactly who, until we have proof enough to make accusations that will actually hold."

Ji Chen's jaw tightened, but he nodded. "Agreed."

"And you will not," Yan Zhao added, sharper, "do anything reckless in pursuit of an answer. I have buried enough soldiers who decided loyalty to me was worth more than their own survival. I will not bury a husband over it as well."

Something flickered across Ji Chen's face at that, surprise, and underneath the surprise, something that looked, for just a moment, almost unbearably soft.

"Careful, Your Highness," he said, voice gone quiet. "That almost sounded like you'd mind."

Yan Zhao looked away, toward the window, toward anything that wasn't the warmth in his husband's eyes. "Don't read too much into exhaustion and bad news," he said. "I have very little patience left today for either flattery or hope."

But he did not, he noticed, ask Ji Chen to leave the room. And when Physician Mei finally took her leave with promises to return within the week for further testing, it was Ji Chen's steady presence beside the chair, rather than Jiang Wu's, that Yan Zhao found himself, however reluctantly, glad to have remain.