Kael heard Sera before he saw her.
That was always how it was with Sera. She did not announce herself with noise exactly — she was too disciplined for that, too well trained in the silent movement arts of Myohyang's royal guard. But she carried with her a particular quality of atmosphere, a sharpening of the air, the way a mountain pass felt different the moment a hawk entered it. Something in the environment simply adjusted to her presence whether it wanted to or not.
He was making tea in the small kitchen of his rented apartment when the front door opened without a knock. He did not turn around.
"You could have told me you were coming," he said.
"You would have told me not to," Sera said, dropping a travel bag on the floor with a sound that suggested it contained approximately everything she owned plus several weapons she had not declared at the border.
"That is correct. I would have." He poured a second cup without being asked and pushed it across the counter. "How did you find this address?"
"Councillor Nara gave it to me." She picked up the cup, examined it, and drank. Her green eyes moved around the apartment with the systematic efficiency of someone conducting a security sweep disguised as casual observation. "She is worried about you."
"Councillor Nara is always worried about me."
"You are frequently worrying." Sera set the cup down and looked at him directly, which with Sera always meant something was coming that she had decided not to cushion. "You have been seen in the company of a merfolk student. Twice."
Kael was quiet for exactly one moment. Then he turned and leaned against the counter with his arms folded, meeting her gaze with the particular expression he reserved for conversations he had been expecting and had not been looking forward to. "I have been seen."
"By the Myohyang intelligence contact stationed at the university. He reported it to Councillor Nara three days ago." Sera's jaw was set in the way it set when she was controlling something she felt strongly about. "A merfolk student, Kael. At the same university. In the same classroom."
"I am aware of where he sits."
"That is not reassuring."
"It was not meant to be reassuring. It was meant to be a statement of fact." He picked up his own cup. "His name is Lee Rion. He is the First Prince of Haesim. He is here for the same reason I am, to understand what his kingdom's council is planning before he inherits the consequences of it. He is not a threat."
Sera stared at him with the expression she reserved for statements she found both completely believable and completely dangerous. "You have been talking to him."
"We have had two conversations."
"Two conversations with the heir of Haesim."
"He is perceptive, controlled, and more skeptical of his own council than the intelligence reports suggest." Kael set his cup down. "He is useful, Sera."
"He is the enemy."
"He is the son of the enemy," Kael said, with a precision that was quiet but firm. "There is a difference. One is a fact about his birth. The other is a choice. He has not made that choice yet and neither have I and I would prefer to gather more information before either of us does."
Sera looked at him for a long moment with the expression that meant she disagreed but recognised she was not going to win this particular argument today. Then she straightened, rolled her shoulders in the habitual way she did when transitioning from one mode to another, and said, "I want to see him."
Kael blinked. "What?"
"If you are going to continue interacting with a merfolk prince then I am going to assess him myself." Her tone left no room for negotiation. "That is not a request."
Kael looked at his sworn guard and closest thing he had to a friend and thought about pointing out that he outranked her. He had learned over many years that pointing this out to Sera produced results roughly equivalent to informing a mountain that it was in the way.
"Fine," he said. "Tomorrow. But you will be civil."
Sera picked up her travel bag. "I am always civil."
"You once told the Duke of the Northern Cliffs that his diplomatic strategy had the structural integrity of wet paper."
"That was accurate. Accuracy is civil." She disappeared down the hallway toward the spare room. "Where does the merfolk prince usually eat breakfast?"
Kael closed his eyes briefly. "Sera."
"I will be civil," she called back, entirely unconvincingly.
He found Rion the next morning at the small convenience store two streets from campus, which was apparently where the First Prince of Haesim's deep-sea kingdom purchased his breakfast. He was standing in front of the onigiri section with the focused expression of someone approaching a strategic decision, which Kael was beginning to understand was simply how Rion approached everything.
Kael stopped beside him. "Salmon," he said.
Rion did not look up. "You recommended the green tea incorrectly yesterday. I am not taking your food advice."
"The green tea was correct. You are simply difficult to please."
"I have standards."
"You have walls," Kael said, and grabbed a triangle of tuna onigiri for himself. "There is a difference."
Rion picked up the salmon one, turned it over once, put it back, and took the tuna. Kael stared at this. Rion walked toward the register without acknowledging the stare.
Outside on the convenience store steps, in the pale Seoul morning with its thin autumn light and its smell of rain and exhaust and someone's breakfast cooking three floors above, they ate in a silence that had become in the space of four days almost comfortable. Almost.
Kael was considering how to introduce the topic of Sera when the topic of Sera introduced herself.
She came around the corner from the direction of his apartment building at a pace that was technically a walk and functionally something more purposeful, her black hair sharp against the grey morning, her green eyes finding Rion with the precision of someone who had been given a description and confirmed it in under two seconds. She stopped in front of them and looked at Rion with the direct unblinking assessment of a predator deciding whether something was a threat or not.
Rion looked back at her with the expression of someone who had also made a rapid assessment and filed it away.
"Sera," Kael said, with the tone of someone introducing two volatile substances to each other in a controlled environment. "This is Lee Rion. Rion, this is Sera. She is my sworn guard and she arrived yesterday without invitation."
"I was invited by my sense of duty," Sera said, not looking away from Rion. "You are the merfolk prince."
"You are the catfolk warrior," Rion said. His voice was perfectly even.
"I have heard Haesim trains its royals in deep current combat." Her tone was not hostile exactly. It was the tone of someone who had not yet decided what it was going to be. "How far does that training extend above water?"
"Far enough," Rion said.
"That is a non-answer."
"It was meant to be."
Something shifted in Sera's expression, not warmth exactly, more like the first fractional adjustment of a door that has been closed for a long time and encountered something worth opening for. She looked at Kael. "He is like you," she said, with the air of someone making a complaint.
"I know," Kael said. "It is deeply inconvenient."
Rion looked between them. "Are all Myohyang's warriors this direct or is she a particular case."
"Particular case," Kael said.
"Good," Rion said. "I find it easier than the alternative."
Sera looked at him for another long moment. Then she sat down on the convenience store step without being invited, in the manner of someone who did not require invitations to claim a space, and unwrapped a triangle of kimbap she had apparently been carrying the entire time. "Sit," she said, to no one in particular and both of them simultaneously. "If we are going to do this then we are going to do it properly."
Kael sat. After a moment, so did Rion.
The three of them ate on the steps in the thin autumn morning while Seoul went about its business around them, entirely indifferent to the fact that it was hosting a catfolk warrior, a merman prince, and a crown prince of mountains on a convenience store stoop.
"The intelligence contact at the university," Sera said, after a while. "He has been reporting your meetings to Myohyang's council. Both of you." She was looking at her kimbap, not at either of them. "I intercepted his last transmission before I left. He has also made contact with someone here in Seoul. A human."
Kael went still.
"An owner," Sera continued, with the calm of someone delivering information she has already processed and is now simply distributing. "Near the east gate."
The name landed between all three of them without being spoken. Kael felt it settle in his chest with the particular weight of a suspicion confirmed too early.
Rion set down the remainder of his onigiri. His expression had not changed. That was, Kael was learning, how you knew something had hit him. Not a flinch. A stillness.
"Minho," Rion said.
"You know him," Sera said. Not a question.
"We both do," Kael said. He looked at Rion. "You said you were not certain whether he was dangerous or useful."
"I am becoming more certain," Rion said quietly.
Sera looked between them with the expression of someone rapidly assembling a picture from pieces she had not expected to find already laid out. "How long has he had contact with you?"
"Since our first week," Kael said.
Sera was quiet for exactly three seconds, which for Sera was the equivalent of a long contemplative silence. Then she said, "We have a problem."
"We have several," Rion said.
"This one first." She finally looked up from her kimbap, green eyes moving between them with the focused clarity of someone who had already begun solving the problem she was describing. "If Minho is feeding information to Myohyang's council through the intelligence contact, then everything you have discussed near him has potentially been reported. Every meeting. Every conversation." She paused. "Everything you told each other at that café."
The morning felt suddenly cooler than the temperature accounted for.
Kael looked at Rion. Rion was looking at the middle distance with that particular focused stillness, thinking through something with the systematic thoroughness of a mind trained in deep water strategy.
Then Rion said, "Or he wanted us to know. About each other. About the meetings." He turned to look at Kael slowly. "He told each of us the other had been there. He did not have to do that. We would not have known otherwise."
Kael felt the thought arrive fully formed, cold and clear as a mountain stream. "He is not just reporting to the council."
"No," Rion said. "He is also directing us." A pause. "The question is toward what."
Sera looked between them both. Then she stood, brushed crumbs from her jacket with the brisk efficiency of someone concluding a tactical meeting, and said, "Then we find out." She looked at Rion directly, and this time the assessment in her green eyes had shifted into something that was not quite accepted but was the precondition for it. "Can you fight?"
Rion met her gaze. "Better than you expect."
The corner of Sera's mouth moved, barely, in the direction of something that was not quite a smile but was the architecture of one.
"Good," she said. "You will probably need to."