The corridors beneath the palace were not built for men; they were built for secrets. Narrow, damp, and colder than the winter winds above, the stone walls seemed to sweat with the collective misery of decades. Torches flickered in iron brackets, casting shadows that writhed like snakes across the uneven floor.

Arin led the way, her breath hitching with every echo. “The Captain said the Western Wing,” she whispered, her voice tight enough to snap. “That’s where they keep the ‘disappeared.’ That’s where Doyun is.”

Hwajin walked with his hands tucked into his sleeves, but his Jeong-gwan was scanning the very air. He didn't just see stone and mortar; he felt the "weight" of the souls trapped here. To the state, this place was a filing cabinet for inconvenient people. To Hwajin, it was a karmic wound in the earth.

Muryeong followed, his eyes darting to the heavy iron bars of each passing cell.

Flashback: Muryeong

The dampness of the dungeon triggered a memory of the hold of a slave transport ship. He remembered being chained to twenty other boys, their identities replaced by a single number on a merchant’s manifest. He remembered the feeling of being "cargo"—something to be stored in the dark until it was profitable to move it. He hated the smell of stone and stagnant water; it smelled like the death of a man’s name.

“Move faster,” Muryeong muttered, his hand grabbing the sword hilt. “This place makes my skin crawl. It’s too quiet. Even the rats sound like they’re reporting to the magistrate.”

Arin stopped at a heavy iron door near the end of the hall. With trembling fingers, she produced the key the Captain had smuggled to her. The lock clicked—a loud, violent sound in the silence—and the door groaned open.

The cell was small, smelling of wet straw and the sharp tang of fear. And there, huddled in the corner, was Doyun.

He didn't look like the boisterous, impulsive boy Arin had left behind. He looked small. He looked erased. But as the torchlight hit his face, his eyes widened.

“Doyun!” Arin lunged forward, catching him as he scrambled to his feet.

Doyun didn't speak. He couldn't. He simply buried his face in his sister’s shoulder, a ragged, silent sob shaking his frame. He pointed toward the back of the cell, then toward the hallway, his movements frantic and uncoordinated.

Hwajin knelt beside them. He placed a hand on the boy’s back, sending a flicker of calm gi through the child’s panicked heart. “Breathe,” Hwajin said softly. “The shadows cannot follow you where we are going.”

Doyun looked at Hwajin, his eyes clearing. He grabbed Arin’s hand, his grip bruisingly tight. He gestured toward the deeper parts of the dungeon—the parts where the "high-value" prisoners were kept.

“He saw it,” Arin whispered, realizing the truth. “Doyun was in the Prince’s retinue because he idolized the guards. He wasn't supposed to be here. He saw them take the real Lee Seon, didn't he?”

Doyun nodded vigorously, his fist clenched. He made a motion across his throat, then pointed toward the upper palace.

“They replaced the Prince with a decoy,” Muryeong realized, his voice a low growl. “And they threw the witnesses—the kids who actually knew the Prince’s face—down here to rot. It’s cleaner than an execution. No bodies to explain, just names removed from the ledger.”

Flashback: Hwajin

Hwajin remembered his father’s study, where the man would cross out the names of illegitimate sons or failed officials. "If a person is not recorded," his father had said, "they do not exist. Reality is what we write down, Hwajin." Looking at Doyun, Hwajin saw the living evidence of his father’s lie. Doyun existed, and his trauma was a truth that no palace record could erase.

“We need to move,” Hwajin commanded, standing up. “The guards change at the bells. If we are caught here, we become names on the same ledger.”

They moved like ghosts. Hwajin led the way, his Jeong-gwan guiding them through the blind spots of the patrols. Arin kept Doyun close, the boy mirroring her steps with a desperate, silent intensity. Muryeong brought up the rear, his single blade drawn and held low, ready to cut down anyone who dared to emerge from the dark.

As they reached the spiral staircase that led back to the servant passages, the air grew marginally warmer. Doyun looked up at the faint light of the moon filtering through a high, barred window. A small, shaky smile broke across his face. He looked at Arin, then at Hwajin and Muryeong, and raised a tiny, defiant fist.

“Thanks...” he whispered, his voice cracked from disuse.

Muryeong smirked, though his eyes remained wary. “Don’t thank us yet, kid. We’re still in the lion’s mouth. And now we know the lion has a fake tooth.”

Arin looked at her brother, then at her unlikely protectors. The mystery was deepening. The real Crown Prince was missing, a puppet sat on the throne, and her brother had been buried alive to keep that secret.

“Why would the palace go to such lengths?” Arin asked as they slipped into the shadows of the upper hallways.

“Control,” Hwajin answered. “A real Prince has a soul. A decoy only has a script. The palace doesn't want a King; they want a marionette.”

Deep in the palace, the shadows shifted. The "administrative evil" of the state was working, but Hwajin, Muryeong, and Arin had just stolen back one of the pieces they thought they had erased.

The game had changed. They weren't just bodyguards anymore. They were the only ones who knew the truth.