The Silent Gaesidae of Jirisan

The whispers emanating from the depths of Jirisan National Park were not mere tales of mist. The rumors, originating from a rural village in Jangsu County, were bizarre. Hunting dogs—nimble Jindo and Sapsal breeds—were vanishing without a trace in the deep mountain paths, with no barks or struggles. It wasn't just a disappearance; it was an absolute 'erasure'. Search parties found no dog scent, no disturbed undergrowth. These reports converged with eerily similar incidents from near Odaesan and Seoraksan, spreading across online forums. What was remarkable was that it wasn't just simple disappearances. There were consistent testimonies of advanced GPS collars, sometimes intact, sometimes unrecognizably crushed, being found kilometers away from where the dogs were last seen, in places no animal could possibly reach. The common thread running through these fragmented reports? A chillingly unnatural silence, and testimonies of a 'heavy, fast-moving, silent presence'. And one more thing: an old regional word that people uttered with a shudder: 'Gaesidae (蓋世臺)'. Meaning 'dog of ancient times' or 'dog of the old dwelling place', the term hinted at something ancestral, territorial, and terribly wrong.

My investigation led me to a seldom-used, winding trail below the Jirisan ridge. Locals called it the 'Shadow Path' due to its perpetual darkness from dense tree cover and sudden precipices. Two weeks prior, a top-tier satellite collar, worn by a champion hunting dog named 'Bada', was found here. It was crushed beyond function, yet bore no teeth or claw marks. Authorities recorded the coordinates and closed the case, attributing it to a bear, despite the lack of any dog's traces or signs of struggle. I ascended the mountain at dawn. The air was thick with the scent of damp earth and pine, but the usual chorus of cicadas and birds was significantly diminished, a heavy silence pressing down between the ancient trees. I carried my usual gear: a directional microphone, a thermal camera, motion-sensing cameras, and a sturdy trekking pole. The path was slick with loose rocks and moss-covered roots, requiring careful footing. The silence felt not like an absence of sound, but like a 'presence of stillness', as if actively absorbing all ambient noise. The only sound was my hiking boots on the ground, which echoed eerily loud.

Deep into the 'Shadow Path', the silence deepened, becoming a physical pressure. My directional microphone, which usually picked up the slightest forest sounds, first emitted static, then recorded an impossible void. It felt as if sound waves themselves were being actively suppressed. The GPS signal flickered erratically, then cut out entirely, displaying 'searching' after briefly showing me in an impossible location. Checking my compass, the needle spun slowly and lazily, then stopped, stubbornly pointing southwest, unlike its precise north bearing moments before. A small, cold stream flowed across the path. Pausing to observe, I witnessed the water exhibiting an impossible flow, appearing to flow uphill for a mere meter before resuming its natural downward course. The thermal camera picked up a faint, indistinct heat signature in the dense undergrowth. It was larger than a deer but lower than a human, moving with an unnatural fluidity. Then, a scent began to emerge: a faint metallic tang, mixed with damp earth, and an alien, wild musk that grew stronger with every step uphill. The feeling of being watched was no longer vague unease; it was a palpable weight on my back, a low-frequency vibration resonating through my bones.

The faint vibration intensified, reverberating through my boot soles into my feet. My headlamp, which usually cut sharply through the darkness, seemed to have its reach significantly diminished, as if its light was being absorbed by the oppressive gloom ahead. There was no rustling, no snapping branches. Yet, from the deep shadows beneath a thick, gnarled oak, a single shadow detached itself. Its movement was impossibly fast, perfectly silent. A massive, low-crouching, obsidian-black form, its edges blurred indistinctly like a heat haze. It moved without displacing air or making a sound. Before I could even register the impossibility, it was upon me. It wasn't charging; it felt like the distance instantaneously compressed. My trekking pole, raised in desperate defense, passed through its shoulder like smoke, hitting no solid mass. But a raw, cold shockwave slammed into my chest, sending me sprawling into a shallow ravine, unable to even gasp for air.

The fall was jarring, twisting my knee. My headlamp struck something and fell off, plunging me into near-perfect darkness, illuminated only by the faint, eerie glow of my phone screen. On that screen, the GPS had finally locked onto a single, impossible coordinate: 'VOID'. I heard nothing, yet felt the crushing 'pressure' of its presence directly above the ravine. A growl resonated, but it was a vibration felt between my teeth rather than a sound heard by my ears. My struggles, my gasps, my attempts to climb were unnaturally muted, as if I were trapped in a soundproof chamber. And then, the walls of the ravine began to close in. The ground groaned, rocks and earth moving at an impossible speed, trapping me. In that moment, my phone's emergency light flickered, briefly illuminating it. The head of a jet-black monstrosity. Its eyes were like twin black holes, not reflecting light, but absorbing it. Its snout was impossibly long, and as it opened, I saw no teeth, only a swirling void, a chasm of pure darkness. It did not breathe. There was no sound. Only the irresistible ravine walls pressing me down, and the ever-approaching, impossible void of silence.

I don't remember how I escaped the collapsing ravine. Only the primal terror, the struggle to clamber over shifting earth, and the blinding, agonizing pain in my leg remain. Hours later, when I finally managed to crawl onto an asphalt road and wave down a park ranger, I was hypothermic, covered in mud and blood, my left knee irrevocably shattered. All my gear had been swallowed by the mountain, but my compass still stubbornly pointed southwest, and my phone remained. Cracked as it was, its camera roll held a single, unalterable image, starkly clear: a black mass among dark trees, impossibly distorted and blurred, but within it, two profound black points that were not reflections of light, but the absence of it. There were no tracks of any large animal around the ravine, only clear evidence of a small, localized landslide due to geological shifts. My report was filed as a 'hiking accident, lost due to hypothermia'. My physical wounds mostly healed, but the silence never did.

In every quiet moment, I hear that oppressive, sound-absorbing void again. And sometimes, in my peripheral vision, I see it. Not a form, but a 'negative space' in the air, a movement that defies light. Disappearances continue in Jirisan. Sporadic, eerily similar incidents. It's not just dogs now. Sometimes, only a single abandoned hiking boot is found, perfectly intact, kilometers from the nearest trail. Its sole worn clean of any mountain dust, as if dragged across an impossibly smooth, vast surface. Park authorities still attribute it all to the unpredictable cruelty of the mountain. But I know what makes that mountain cruel. I know what moves in that silent void. And sometimes, late at night, when the house is still, I feel that low-frequency vibration resonate through my teeth again, and I wonder if that impossible chasm of darkness has truly turned its back on me.