The year the Great Yuan Empire fell was also the year Yun Su learned that some debts cannot be paid in gold.

He was seventeen years old when he died the first time — or rather, when he should have died. The palace was burning. The Cang soldiers poured through the eastern gate like black water through a cracked dam, and the Yuan emperor's remaining loyal guard had been reduced to seven men and one fool.

The fool's name was Xiao Hou Chuan.

He was the third son of the Su Clan, a family of generals so decorated their ancestral hall could wallpaper the Imperial Hall twice over. Xiao Hou Chuan himself had none of his father's strategic genius, none of his eldest brother's sword-speed, and none of the court's political cunning. What he possessed instead was something more dangerous: an absolutely uncomplicated sense of right and wrong, and arms broad enough to shield a fleeing prince from three crossbow bolts.

Two of those bolts had meant for Yun Su.

"Go," Xiao Hou Chuan had said, blood already darkening his blue robe from shoulder to hip. He didn't look frightened. He looked the way a man looks when he has already made his decision and is merely waiting for the world to catch up. "Go, Your Highness. I'll hold them."

"You'll die," Yun Su said. It was a stupid thing to say. He was seventeen and had never learned the art of elegant last words.

Xiao Hou Chuan had smiled — that wide, uncomplicated smile that Yun Su had seen across banquet tables and training grounds a hundred times and never once thought to memorize. "Probably. Now go, before I waste the gesture."

Yun Su had gone.

He had not stopped running for six years.

— ✦ —

The Cang Empire absorbed what remained of the Great Yuan like a tide consuming a sandcastle. Yun Su survived by becoming no one: a traveling merchant's apprentice, a temple sweeper, a river ferryman. He grew from a soft-handed prince into something leaner and harder and far more dangerous — a man who had learned that survival is not a gift but a craft, and that the craftsman must be willing to make ugly things.

But in every city he passed through, in every inn where he slept with one eye open, one question followed him like a persistent ghost: Is Xiao Hou Chuan alive?

The answer, when he finally discovered it five years later through a network of Yuan loyalists operating in the shadows of the new empire, was both more complicated and more infuriating than a simple yes or no.

Xiao Hou Chuan was alive. He had survived his wounds by some miracle of constitution that the physicians who treated him could not explain. He had been captured, ransomed by his clan, and installed — with considerable grumbling on his part, according to sources — as the Su family's representative at the court of the Cang Empire's northern territory.

He was, by all accounts, enormously respected. Bafflingly honest. Irritatingly incorruptible. And utterly, completely unaware that the man he had shielded with his body in a burning palace was now planning to dismantle the empire that had killed their world, piece by careful piece.

Yun Su stood in the cold mountain wind above Beiping Province and looked down at the city where Xiao Hou Chuan slept, and felt something tighten in his chest that was not grief and not quite love and was perhaps the most inconvenient feeling a man engaged in patient, meticulous revenge has ever experienced.

I will repay you, he thought. The only question is how.

The thing about Xiao Hou Chuan, Yun Su observed from behind his alias and his merchant's fur coat, was that he was exactly as inconvenient as memory had made him.

Six years should have changed a man. Six years of empire-building and political compromise and the slow corruption of proximity to power should have worn down those sharp, guileless edges. The Xiao Hou Chuan that Yun Su had carried in his memory was a young man of twenty-three, idealistic and almost comically sincere — the sort of man who apologized to his horse when he rode too hard, and who once stood in the rain for two hours outside a merchant's stall because he'd accepted change for a coin he later realized wasn't his.

The Xiao Hou Chuan who sat at the Beiping Governor's banquet table, calmly and without apparent discomfort, informing the Governor that his tax records were fraudulent and that he should expect an imperial audit within the month, was that same man. Bigger, perhaps. The shoulders that had stopped those crossbow bolts had broadened further. The face that had been boyish was now something that stopped serving maids in their tracks and made junior officials stand straighter without knowing why.

But the directness was the same. The total absence of political maneuvering was the same. The way he looked at you like he was simply describing observed fact, not delivering a threat, while somehow making the threat considerably more terrifying — unchanged.

"He really told the Governor that," Yun Su murmured to A-You, his young attendant, who had come with him from the south disguised as his nephew. "At a banquet. Over pork."

A-You — whose real name was Chen Ayou and who was fifteen years old and had opinions about everything — nodded with visible admiration. "Lord Su also told the Governor's wife that her embroidery pattern was inauspicious for a woman with three daughters and that she should consult a different pattern-book. While she was wearing the embroidery."

"Incredible," Yun Su said. He meant it entirely.

It was going to be very difficult to infiltrate the household of a man who said exactly what he thought without exception. Yun Su had spent three months building a cover identity as Lin Fengyi, a spice merchant from the south with connections to the coastal trade routes and an interest in establishing a permanent warehouse in Beiping. It was a solid cover. A useful cover. A cover that would have worked on approximately every other official in the Cang Empire's northern territories.

What it would not survive was Xiao Hou Chuan simply looking at him with those steady, dark eyes and saying "That story has three inconsistencies and your hands are not a merchant's hands, they're a fighter's hands," which was, Yun Su calculated, exactly what would happen the moment he sat across a table from the man.

He needed a different approach.

The different approach presented itself at midnight, in the form of three assassins with Cang Northern Intelligence markings on their blades, who had apparently reached the same conclusion that Yun Su had: that Xiao Hou Chuan's honest tongue was a liability to someone important, and that the man should be removed.

They were professionals. They were also, unfortunately for them, operating in a city where Yun Su had spent the last two weeks memorizing patrol patterns.

He disposed of two before they reached Xiao Hou Chuan's window. The third made it into the room. The sound of furniture breaking suggested Xiao Hou Chuan had handled that one himself, which was both reassuring and professionally interesting.

By the time Yun Su climbed through the window — the door seemed impolite — Xiao Hou Chuan was standing in the center of the room with a lamp in one hand, the unconscious assassin at his feet, and an expression of mild inconvenience rather than terror.

He looked at Yun Su. Yun Su looked at him.

Six years. Six years of a burning palace and a wide smile and two crossbow bolts that should have been his.

"Your hands," Xiao Hou Chuan said calmly, "are a fighter's hands."

Yun Su, who had rehearsed approximately forty different versions of this meeting, said: "You hit a trained assassin with a lamp."

"It was the first thing I reached." Xiao Hou Chuan set the lamp down. His eyes had not left Yun Su's face. There was something working in them — not recognition, not yet, but the particular concentration of a man who is trying to locate a memory. "Who are you?"

This was the question. The answer Yun Su had prepared was Lin Fengyi, spice merchant. The answer that came out of his mouth was: "Someone who owes you a debt."

Not a lie. Not the truth. Something more dangerous than both.

— ✦ —

Xiao Hou Chuan did not recognize him that night.

This was perhaps the greatest mercy the universe had ever offered Yun Su, and he treated it with the appropriate caution — that is to say, he did not trust it.

Xiao Hou Chuan had known Prince Yun Su of the Great Yuan Empire as a seventeen-year-old boy with the scholar's build that court life produced, soft-handed and reed-thin and possessed of the careful bearing that came from a childhood spent being watched by ambitious ministers. The man before him was twenty-three, had worked with his hands and his body for six years, and had the particular stillness of someone who had learned violence the way other people learn a language: late, through necessity, but fluently.

It was enough. The face was different. The voice was — not different, but controlled in a way it hadn't been. The eyes were the same, but Xiao Hou Chuan was looking for a dead prince, not a living merchant.

"Debt," Xiao Hou Chuan repeated. His tone suggested he was filing this information in the part of his mind reserved for things that required further investigation. "What kind of debt?"

"The kind that requires close proximity to discharge." Yun Su moved further into the room, stepping over the unconscious assassin with the practice of a man who encounters unconscious assassins regularly. "I'd like to serve in your household. In whatever capacity you'll have me."

"You just killed two men in my courtyard."

"I did."

"And broke the third one's arm."

"He'll keep."

Xiao Hou Chuan studied him for a long moment. Yun Su had learned, in his years of becoming no one, to be comfortable under scrutiny. He stood still and let himself be examined.

"What's your name?" Xiao Hou Chuan asked finally.

"Lin Fengyi." A pause. "For now."

For the first time, something that might have been humor moved through Xiao Hou Chuan's expression. "That's an honest answer."

"I don't lie," Yun Su said. Which was technically true. He had become very good at saying true things in misleading arrangements.

Xiao Hou Chuan was quiet again for a moment. Then: "My household steward position has been vacant since last month. The previous occupant was apparently sending reports to someone in the capital." He said this with the equanimity of a man describing mildly inconvenient weather. "I haven't replaced him because I haven't yet identified someone I trust."

"And you trust me?" Yun Su asked, genuinely curious about the answer.

"No," Xiao Hou Chuan said. "But you also weren't reporting to the capital's intelligence service, or they wouldn't have sent assassins. Which means your agenda, whatever it is, doesn't align with theirs." He picked up the lamp again, apparently deciding the conversation was over. "The position is yours if you want it. The pay is standard. You'll share meals with the household. And I should warn you that I will eventually figure out what your actual name is."

"I look forward to it," said Yun Su, and meant that, too.

— ✦ —

Living in the household of Xiao Hou Chuan was, Yun Su discovered, an experience that defied every preparation he had made for it.

He had anticipated discipline. The Su family's military tradition was well documented; their household accounts suggested a staff of twenty, efficient and professional, running on a schedule calibrated to the minute. What he had not anticipated was warmth.

The cook, Old Madam Fen, made soup every morning and pressed it on the household staff with the aggressive affection of a woman who understood love primarily as a nutritional concept. The stable master, Uncle Hu, had opinions on everything and shared them freely. A-You, who Yun Su had initially planned to house elsewhere once he was established, had somehow integrated himself into the household within three days and was now following the household's elderly physician around asking questions about herbs with the intensity of a scholarly vocation.

And then there was Xiao Hou Chuan himself.

Xiao Hou Chuan, Yun Su discovered, was the sort of man whose household reflected him: busy and purposeful and perplexingly content. He worked long hours — receiving petitioners, auditing accounts, corresponding with the capital on matters of northern territory governance. He trained with his sword every morning at a time that suggested he had not yet discovered the concept of sleeping in. He ate whatever was placed in front of him without complaint, thanked whoever had cooked it, and had the particular talent of making everyone in a room feel that their contribution to the world was both noticed and valued.

It was deeply, profoundly inconvenient.

Yun Su's plan — to infiltrate the household, establish trust, use Xiao Hou Chuan's position and network to gradually dismantle the Cang Empire's control over the northern territories while locating the remnants of Yuan's loyal forces — had been built around the premise that Xiao Hou Chuan was an obstacle to be navigated, a useful tool and a name from the past, someone he owed a debt to and intended to repay in whatever coin seemed appropriate.

The plan had not accounted for Xiao Hou Chuan asking, on Yun Su's third morning as household steward, whether he had slept well.

"I noticed you moving around the east courtyard at three in the morning," Xiao Hou Chuan said over breakfast, without looking up from his correspondence. "The nightmares, or something else?"

"Reconnaissance habit," Yun Su said, which was true.

"The household is secure. You checked it yourself when you arrived and I've seen your work — it's thorough." Xiao Hou Chuan set down his brush. He was looking at Yun Su with that direct, unclassifiable regard that Yun Su was beginning to learn was simply how he looked at things he was thinking about. "Was it nightmares?"

A beat. "Yes," said Yun Su, because Xiao Hou Chuan's honesty operated like a kind of gravity — it bent you toward truth whether you intended to go there or not.

Xiao Hou Chuan nodded, unsurprised, and picked up his brush again. "There's a room in the south wing that faces the garden. I've noticed the open-air view sometimes helps." A pause. "I'll have your things moved there today."

That was all. No questions. No pressing for details. Just a practical adjustment, offered without ceremony, as if noticing another person's difficulty and doing something about it was simply the obvious response.

Yun Su, who had not slept a full night in six years and had long since stopped expecting anyone to notice, found he had nothing at all to say to this.

In the south wing room that night, with the garden visible through the window and the stars sharp and cold above the winter-bare branches, he lay awake and thought about the debt he owed and the shape of how to repay it and the uncomfortable, circling suspicion that what he'd understood as a debt might be something else entirely.

It would be much easier, he thought, if Xiao Hou Chuan were less himself.

— ✦ —