The frost on the northern peaks did not melt under the rising moon; it hardened, turning the world into a jagged landscape of glass and charcoal.

As Saheon and Yuji emerged from the throat of the frozen cave, the air hit them like a physical blow. The silence was no longer peaceful. It was a predatory stillness. Saheon’s eyes, sharpened by a strange, cold clarity since his fingers had closed around the black hilt, immediately dropped to the fresh powder near the entrance.

Deep, heavy depressions marred the snow. Four-toed prints, each as wide as a child’s head, trailed in a semi-circle around the cave mouth.

"The Great Tiger," Yuji whispered, his breath hitching. The arrogance that had fueled his jealousy moments ago vanished, replaced by the primal terror of the hunted.

"We have to move," Saheon said. He held the black sword close to his chest. It felt unnaturally light now, as if it were a part of his own arm. "The sun is gone. If the mountain doesn't freeze us, Father will kill us before the beast does."

But the friction between the brothers was a fire that the cold couldn't douse. As they scrambled through the waist-deep drifts, Yuji’s fear curdled back into a bitter, biting resentment. He watched the way the pale moonlight slid off the oily surface of the blade Saheon carried.

"It should be in my hands," Yuji hissed, his voice cracking with a sudden, sharp malice. "I found the trail. I felt the pull. You only have it because you were greedy, Saheon. You took what was meant for me."

"I took it to save you!" Saheon snapped, turning back. "You were dying on the ice, Yuji. You couldn't even breathe!"

"Liar! You just wanted the power for yourself!"

Their shouting was a jagged tear in the silence of the woods. It was a dinner bell for the darkness.

From the thicket of frost-covered larches, a low, guttural vibration rumbled through the earth. The tiger emerged like a ghost made of gold and shadow. It was immense, its eyes glowing with a sickly yellow light. It stood ten feet away, its muscles tensed for the killing spring.

Yuji’s face went white. In a blind, frantic panic, he shrieked and shoved Saheon hard to the side. "Take him!" Yuji cried, bolting into the deep brush, his survival instinct overriding every bond of blood.

The tiger crouched, its gaze shifting to the fallen Saheon. It bared teeth like ivory daggers, ready to crush the boy’s skull. But then, the beast’s yellow eyes drifted down to the black blade in Saheon’s hand.

The tiger froze.

The apex predator of the Goryeo North—a beast that feared neither fire nor the bows of men—let out a whimpering, pathetic sound. It didn't roar. It recoiled, its ears pinning back as if it were looking at a hole in the universe. With a haste that was unnatural, almost frantic, the Great Tiger turned and fled into the darkness, its tail tucked between its legs.

Saheon stood up slowly, dusting the snow from his furs. Yuji crept back out of the brush, his eyes wide with a mix of shame and renewed awe.

"Did you see that?" Yuji laughed, a high, nervous sound. "The beast ran! It must have smelled Father on us. It knows the Jang name! It knows Father’s arrows!"

"Yes," Saheon said quietly, though he knew the truth. The tiger hadn't been scared of their father. It had been scared of the iron.

They ran the rest of the way, the fear of the forest replaced by the dread of the cabin. When they burst through the door, the warmth of the hearth felt like a mockery. Jang Myeung stood by the table, his face a mask of iron-hard fury. Without a word, he grabbed the birch rod.

The beating was methodical and silent. Myeung didn't strike out of malice, but out of a desperate, northern need for discipline. In this land, disobedience was a death sentence. Saheon took the blows with his jaw locked, but Yuji didn't seem to feel them. His eyes were fixed on the corner where Saheon had leaned the black sword. He wasn't sorry for the worry he’d caused; he was only hungry for the steel.

"You scold me?" Yuji whispered later that night as they lay in the loft. "You got us in trouble because you wouldn't give me the sword."

"We are lucky to be alive," Saheon hissed back.

Below them, the sound of their mother’s coughing had changed. It was no longer a dry rasp; it was a wet, heavy rattle that seemed to shake the very walls of the cabin. Altan was fading. The light in her eyes was being eclipsed by a grey, terminal shadow.

Myeung picked up the black sword from the corner. He ran a calloused thumb near the edge, and his entire body flinched. He looked at the blade with a deep, instinctual revulsion.

"This is not a tool for men," Myeung muttered. "It feels like a grave."

The next morning, Myeung took the sword outside. Saheon watched through the frost-cracked window as his father dug a shallow hole beneath the roots of an ancient, dead oak and buried the weapon.

"Stay with your mother," Myeung commanded the boys as he slung his quiver. "Make the bone soup. Ensure she eats. I will be back by sunset with fresh meat."

But as soon as the father’s silhouette vanished into the mist, a strange lethality settled over Saheon’s mind. He recalled his dream from the night before—a voice, melodic and cold, whispering through the floorboards.

The blade is a vessel. It holds the warmth the mountain stole. Place it near her heart, and the ice in her lungs will melt.

"I heard it too," Yuji said, standing behind him. "The dream. It told me the sword could save her."

They didn't argue this time. Their love for Altan was the only thing stronger than their rivalry. Together, they ran to the oak tree, dug through the frozen earth with their bare fingernails, and retrieved the black iron. They snuck into their mother’s room, where she lay in a fevered stupor, and tucked the sword beneath her thin mattress, directly under her chest.

"She looks warmer already," Yuji whispered.

They spent the day in a state of frantic hope, making the soup and stoking the fire. But when the next morning’s light touched the window, the silence in the house was absolute.

Saheon entered his mother’s room first. Altan was still. Her skin was the color of blue marble, her eyes open and glassy, staring at nothing. She wasn't just dead; she looked emptied, as if the very essence of her life had been siphoned away, leaving only a husk of cold meat.

"No," Saheon choked out. The grief hit him like a mountain of ice. He reached under the bed and pulled out the sword. It felt different now. It was no longer cold. It was pulsing with a faint, sickening warmth.

"It was the sword!" Saheon screamed, his voice breaking. "It didn't save her! It ate her!"

"You did it wrong!" Yuji shouted, his grief turning instantly into a defensive rage. "You placed it wrong! Give it to me, I'll fix it!"

"It’s going back to the cave!" Saheon lunged for the door, but Yuji tackled him.

The brothers thrashed on the floor of the cabin, surrounded by the smell of their mother’s death. They were two pups fighting over a bone, but the bone was a demon.

"Give it to me!" Yuji shrieked, reaching for the hilt.

In the struggle, Saheon tried to push his brother away. He didn't mean to draw the blade. He didn't mean to swing. But the sword seemed to move of its own volition, a flash of black light in the dim room.

The sound was a sickening, wet thud.

Yuji went still. He looked down at his chest, where the black iron had vanished into his ribs. There was no blood. Instead, a swirl of dark, oily smoke began to pour from Yuji’s mouth and eyes, flowing up the length of the blade and into Saheon’s hands.

Saheon felt a terrifying surge of energy. His muscles tightened, his vision sharpened, and his grief was suddenly muted by a cold, artificial strength. He was receiving the remaining years of his brother’s life—every unspent heartbeat, every future breath, flowing directly into his marrow.

"Yuji..." Saheon gasped, falling back.

His brother’s body didn't just die; it withered, shrinking into a small, pale mound on the floor.

Bewildered and screaming, Saheon ran from the house. He sprinted until his lungs burned, reaching the river that cut through the valley. With a howl of pure hatred, he hurled the black sword into the rushing, icy water. "Stay there!" he wailed. "Stay in the dark!"

He ran back home, his mind a fractured mess of guilt, hoping—praying—that he had imagined it all. But when he reached the cabin, the sword was already there. It was leaning against the doorframe, bone-dry and waiting. He didn't remember picking it up. He didn't remember walking back to the river. The blade had simply returned.

The sound of boots crunching in the snow announced his father’s return.

Jang Myeung stopped ten paces from the house. He saw Saheon standing in the crimson-stained snow, holding the black sword. He saw the small, withered shape of Yuji lying near the porch.

"What have you done?" Myeung’s voice was a dead thing.

He rushed past Saheon into the house, finding Altan’s cold body. When he emerged, his eyes were no longer those of a father. They were the eyes of a judge.

"That blade is a cancer," Myeung said, his voice trembling with a grief so deep it had turned into stone. "It has taken my wife. It has taken my son. Give it to me, Saheon. I will shatter it against the mountain. I will end this curse."

"No," Saheon whispered. He didn't want to say it. He wanted to give the sword away. He wanted to be free.

But as Myeung stepped forward, the sword began to vibrate. Saheon’s arm rose, his muscles locking into a rigid, mechanical stance. He felt the sword’s will overriding his own, forcing his hand to level the point at his father’s heart.

"Father, stop!" Saheon cried, tears streaming down his face. "I can't move my arm! It’s making me—"

Myeung didn't stop. He was a man of the North; he would rather die than live in a world governed by such an atrocity. He lunged forward to grab the hilt.

The sword didn't even need to strike. As Myeung’s hand touched the metal, the black smoke erupted again.

It was faster this time. Saheon watched in a paralyzed horror as his father—the strongest man he had ever known—was literally inhaled by the blade. Myeung’s soul, his decades of hunting, his strength, and his sorrow were sucked into the iron in a singular, violent vacuum.

The surge of power that hit Saheon was unbearable. He felt it with his whole being. His heart slowed to a rhythmic, heavy throb. His skin grew cool as his vision started to blur. 

The world went black.

When Saheon woke up, he was miles away, deep in the heart of the frozen forest. The sun was high, but it offered no warmth. He looked down at his hands. They were steady. He was holding the black sword, and it felt as natural as a limb.

He searched his mind for a memory, a face, a reason for the hollow ache in his chest.

Altan... Yuji... Myeung... The names were like smoke, drifting away before he could grab them. He remembered a fire. He remembered the smell of soup. But the faces were gone, edited out by the ink in his veins.

"Jang Saheon." he whispered to the trees. "I am…Saheon. I am…Jang Saheon."

He didn't know why he had to keep the sword safe. He only knew that it was of utmost importance to keep the blade safe from other people. He turned toward the northern border, toward the Jurchen land, walking with the unsure step of a lost boy who no longer had a home to return to.