Chapter Text
The sea was singing.
It always sang in the Siren Kingdom.
Sometimes it was bright and playful, rippling through the coral towers like laughter. Sometimes it was low and reverent, a hymn carried through ancient caverns older than memory. Tonight, it was jubilant. Music streamed through every current, weaving around pillars of pearl and glass, threading itself through the open plazas where lantern-fish drifted in ribbons of gold.
The kingdom glowed.
Palaces carved from living coral rose in elegant spirals toward the distant surface, their walls lit by bioluminescent vines and moonstone embedded in archways. Schools of silver fish darted through gardens of sea flowers. Children chased one another between shell bridges while elders sang blessings into the water.
Tonight was the Tide Festival, and for the first time in weeks, Sunghoon wished he could disappear.
“You look miserable,” Sunoo said pleasantly.
Sunghoon glanced sideways. Sunoo hovered beside him in the royal procession, dressed in layered silk the color of sunrise, dark hair floating around his face like ink in water. He looked radiant and entirely too amused.
“I am miserable.”
“You hide it well.”
“I’m standing beside you. No one is looking at me.”
Sunoo grinned. “As they should.”
Ahead of them, Riki turned around so quickly he nearly collided with one of the guards. “Can you two stop talking and swim faster?”
“You’re the one turning around every ten seconds,” Sunghoon said.
“I’m checking if you old people got lost.”
“You’re only four years younger than us.”
“And yet wiser than both of you.”
Riki flashed them a grin sharp enough to cut rope and spun back around, racing ahead through the grand avenue toward the central plaza.
Sunghoon watched him go, helplessly fond.
His younger brother moved through the water like he had been born from it, quick, bright, and impossible to contain. Gold ornaments glinted in the dark curls around his face, crooked because he never wore ceremonial items properly. Even now, on the most formal night of the season, one sleeve hung loose where he’d clearly fought with it.
Their mother would have scolded him.
The thought hit hard enough that Sunghoon looked away.
Beside him, Sunoo’s smile softened. “She would’ve laughed first,” he said quietly.
Sunghoon exhaled. “You read minds now?”
“No. You make the same face every time you miss someone.”
“I have many faces.”
“You have three. Annoyed, pretending not to be annoyed, and sad.”
“That is slander.”
Sunoo looped an arm through his and dragged him forward before he could retort. “Come on, Your Highness. If you sulk any harder, the coral will wilt.”
They emerged into the central plaza with the rest of the procession.
Even Sunghoon had to pause.
The Heart Basin sat at the center of the city, a vast circular pool fed by glowing currents from the deep trenches below. Tonight its waters shimmered with ancient magic, ribbons of blue-white light spiraling upward like stars set free. Thousands had gathered around it. Music pulsed from drums carved from whale bone and strings strung with silver kelp.
At the far dais stood the royal family’s remaining court. Their father stood at the front, wearing formal armor instead of festival robes.
Sunghoon’s chest tightened.
He had noticed it earlier and said nothing. Now, seeing it beneath the lantern glow, impossible to mistake, unease slid cold through him.
Riki reached the dais first and slowed, grin fading when he saw it too.
Their father smiled anyway. “My sons.”
Sunghoon bowed his head. Riki did the same, though less gracefully.
Sunoo offered a respectful nod. They were long past trying to get him to do more than that.
“You are late,” the king said.
“We were waiting for Hoon to finish being dramatic,” Riki said.
“I was dressed before you.”
“And yet you whined about it the entire time.”
The king laughed, a warm, full sound that eased something in Sunghoon despite himself.
“You two will embarrass your bloodline long after I am gone,” the king said.
“Then you should stay forever,” Riki said immediately.
The king’s expression changed so subtly most would miss it.
Sunghoon did not.
He stepped forward. “Father.”
The older siren rested a hand briefly on his shoulder, then on Riki’s. “There are rumors near the outer reefs,” he said quietly. “Scouts missing. Strange ships. Creatures moving where they should not.”
Riki straightened. “Why wasn’t I told?”
“Because you would have gone looking alone,” Sunghoon murmured.
“I would have taken guards.”
“You would have outrun them.”
That was true enough to silence him.
Sunghoon turned to their father. “Do you believe we’re in danger?”
“I believe power attracts hunger,” his father said softly.
Sunghoon’s gaze flicked to the glowing basin.
The Heart Basin.
The source from which the kingdom drew protection, healing, and song, ancient magic bound to siren blood.
Sunghoon had grown up hearing enough stories to know that if the basin ever fell into enemy hands, the sea itself would mourn.
Before he could ask more, horns rang through the plaza.
The ceremony had begun.
Their father stepped onto the dais edge. The gathered crowd quieted instantly.
“My people,” the king called, voice carrying effortlessly through water and stone alike. “Tonight we honor the tides that carry us, the ancestors that guard us, and the future that rises before us.”
Cheers answered him.
Sunghoon stood to one side with Riki and Sunoo while offerings were brought. Pearls, carved shells, woven charms, and songs from each district. Children performed old dances badly and were applauded wildly anyway.
For a little while, it felt normal. For a little while, Sunghoon forgot the armor and the looming threat.
Then the first scream came.
It tore through the music like a blade. Heads snapped toward the western gate.
A guard flew backward into the plaza, armor split open, blood unfurling in the water behind him.
The crowd froze.
Then everything happened at once.
Dark shapes poured through the gate arches, figures in bone-black armor riding creatures made of scaled shadow. Spears of jagged obsidian flashed. Coral towers shuddered as explosions of black fire struck them.
Panic detonated and people scattered in every direction.
“Shield the basin!” the king roared.
Royal guards surged forward and Riki had already lunged for a fallen spear.
“Riki!” Sunghoon caught his arm.
“Let go!”
“You stay with me.”
“I am not a child!”
“You’re my brother. I have to protect you.”
Another blast hit nearby, shattering a shell bridge overhead. Fragments rained down.
Sunoo dragged both of them aside just before debris crushed where they’d been.
“Fight later,” he snapped. “Survive now.”
The invaders moved with terrifying purpose, not slaughtering randomly, but driving straight toward the Heart Basin.
“They know what they want,” Sunghoon said.
Their father was already in battle, trident singing arcs of blue light through the water. Every strike sent enemies reeling. Guards rallied around him.
“Take the southern tunnels!” the king shouted when he saw them. “Now!”
“No!” Riki yelled back.
“That is an order!”
Sunghoon hesitated one fatal second.
Then another scream rose, from the collapsing western gate.
Sunoo.
He had turned to help a child trapped beneath broken stone. A shadow creature lunged from the smoke-dark water behind him.
“Sunoo!”
Sunghoon moved before thought.
He rammed into the creature, driving it sideways as jaws snapped inches from Sunoo’s throat. Riki’s spear punched through its neck a heartbeat later.
The beast dissolved into black mist as more rubble crashed down.
Sunoo shoved the child toward fleeing civilians, then gasped as a slab of coral pinned his tail.
“Go! Leave me!” he shouted.
Sunghoon ignored him, bracing both hands under the stone. Riki joined him, teeth bared. Together, they lifted enough for Sunoo to wrench free with a cry.
Blood streamed from his side.
Riki caught him before he could sink.
“We need to move,” Sunghoon said.
The plaza was lost. Enemies surrounded the basin. Guards fell one by one. Their father fought at the center like a storm given form.
Then the Heart Basin cracked.
A sound like the world breaking rang through the city.
Blue-white light burst upward so bright it blinded them.
The shockwave hurled everyone backward.
When Sunghoon could see again, the basin was fractured, magic spilling out in violent streams. The protective songs woven through the kingdom sputtered into silence.
“No,” Sunghoon whispered.
Their father looked toward them across the ruined plaza. For one suspended instant, all chaos fell away.
Run, his eyes said.
Then a spear of black fire struck him through the chest.
Riki screamed.
Sunghoon grabbed him as he thrashed forward. “No!”
“LET ME GO!”
“You’ll die!”
“He’s--”
“I know!”
It was the hardest thing Sunghoon had ever done.
He dragged Riki backward while Sunoo, pale with pain, clung to both of them. Through broken streets they fled as the kingdom burned behind them.
The southern tunnels trembled around them, ancient escape passages cut through reefstone generations ago. The water filled with ash and magic sparks.
Riki sobbed openly, punching the wall until his knuckles bled.
Sunghoon could not cry. Not yet.
At the tunnel vault, he forced shaking hands to open the royal emergency cache.
Inside lay three silver necklaces, each set with a pearl glowing faintly from within.
Sunoo stared. “These are--”
“Mother left these for us,” Sunghoon said hoarsely.
“It would mean exile,” said an old voice.
They turned.
Captain Mira, their father’s oldest guard, drifted in the tunnel entrance, bleeding from half a dozen wounds. She pressed a bloodstained map into Sunghoon’s hand.
“Lost Island,” she said. “If the Heart Basin has fallen, only the Source there can restore what was taken.”
Riki wiped his face furiously. “Then come with us.”
She smiled sadly. “Someone must close the gates behind you.”
Sunghoon shook his head. “No.”
“You are king now.”
The words struck harder than any weapon.
“I’m not ready.”
“No one is.”
She clasped the necklace around his throat, then Riki’s, then Sunoo’s.
“When you reach land, they will hide what you are. Trust few. Move quickly. The enemy will hunt survivors.”
Sunoo whispered, “There may be others?”
“There is always hope.”
Behind her, the tunnel shook with approaching footsteps.
Mira drew her blade. “Go.”
Sunghoon wanted to refuse. To fight. To stay. To die where everything he loved had died.
Instead, he took Riki’s wrist with one hand and Sunoo’s with the other.
They left.
The last thing he heard was Mira’s battle cry echoing through the stone.
Then darkness swallowed them whole.
<<>><<>><<>><<>>
They surfaced beneath dawn.
Cold air struck Sunghoon’s face like another world.
He coughed, dragging himself onto rough sand beside a line of weathered docks. Riki collapsed nearby, transformed mid-breath into human shape, legs tangled, cursing violently. Sunoo landed face first into the sand and then started laughing hysterically.
Sunghoon looked down.
Human hands. Humans legs. Saltwater-soaked clothes conjured by magic.
It should have felt absurd.
Instead, he felt nothing.
Beyond the shore rose a harbor town waking to morning. Human voices drifted over the water. Bells rang somewhere distant. Gulls screamed overhead.
Behind them, beyond the horizon, their kingdom was gone.
Riki rolled onto his back and stared at the sky with red-rimmed eyes.
“What do we do now?”
Sunghoon’s fingers closed around the map. He looked toward the town.
Somewhere in this human world was a ship, somewhere beyond these shores was Lost Island, and somewhere in the ruins of the sea, vengeance waited.
“We keep going,” he said.
Then he stood, and led what remained of his kingdom toward land.