13 Iron Rules That Must Never Be Broken… Even If No One Knows Why. When Kawin and eleven others receive a mysterious black invitation, they are brought to a place called “The Forbidden Aquarium”—a facility that appears on no map. The doors are sealed. The rules are announced. And every violation… is paid with death. But the more they obey, the more they begin to lose themselves. And when the final rule declares: “Do not challenge the rules,” some begin to wonder— If we never defy them… how will we ever survive?
View More“This is not a place to learn... This is a place where you must accept that you know absolutely nothing.”
A crackling voice echoed from an old recording tape in the darkness, startling anyone who heard it. The voice was distorted, as if the equipment belonged to an era when people still used film cameras and cassette tapes.
The sudden noise filled Praewa with a deep unease. She had no idea how the recording had started playing—or even when she had entered this room in the first place. It was as if she had simply fallen asleep and awakened here, with no memory in between.
The room was four by four meters in size, its walls tiled in faded bluish-grey. The ceiling bore patches of water stains, evidence of failed repairs. In the center stood a large aquarium, illuminated on one side, even though every other electrical device in the room had long ceased functioning.
Inside the tank, there were no fish, no plants—nothing at all.
Except water... and a shadow.
A dark, indistinct shape was slowly rising from the depths.
“Have you ever wondered how different humans and fish really are?”
The voice from the speaker posed the question again, though it seemed the speaker wasn’t expecting an answer—only fear from the listener.
“Where... is this place?” the woman murmured, glancing around in confusion.
She stepped closer to the aquarium, slowly reaching out to touch the glass. It felt freezing cold—like the temperature inside a morgue.
No one answered her question.
Only fragments of memory flickered in her mind, as if something had just brought her here.
An invitation?
Yes. A pitch-black card with no name or address, only glimmering silver letters that read:
“WELCOME TO THE FINAL OBSERVATION.”
That was all she could recall. At first, she had no idea what it meant—until an unmarked taxi pulled up in front of her home, the driver claiming to take her to the destination described in the mysterious invitation. She had stepped in, heart pounding. She couldn’t even explain why she trusted the faceless man behind the wheel—but something in her subconscious compelled her to go.
The taxi traveled down nameless roads. When they arrived, she found a building with no visible entrance. As she stepped out in confusion, the taxi pulled away before she could even turn to speak.
As fear welled up within her, the previously blank wall suddenly rumbled and split open, revealing a massive hidden door.
The next thing she knew, she was already seated in this room.
“Observation is violation.”
“To ask is to defy.”
The voice continued, now strangely more vivid, almost alive.
She noticed small bubbles floating slowly upward inside the aquarium, but they never burst or reached the surface. They simply hung there—suspended, as if time had stopped. Yet, everything else in the room remained in motion.
The door creaked open—so softly, it barely made a sound. Then came footsteps, drawing nearer.
A man entered the room.
He wore a grey suit, a pale blue tie. His face expressionless, he never even looked at her, despite her presence in the room. Without a word, he stepped beside the aquarium, staring at the floating shadow and bubbles, just as she was.
“Do you see it?” he asked, not turning his head.
“W-what?” she responded, puzzled.
“Do you see it?” he repeated, motioning with his chin toward the shadow in the tank.
“What... is it?” she asked hesitantly.
“The final shadow of those who doubted,” he said, turning to her. His deadpan stare sent shivers down her spine. “And you... are the next one chosen to see it.”
“W-what do you mean?” she asked, still not understanding. But he gave no further response.
“Why am I here?” she pressed.
Sigh...
He let out a tired breath, as if the question bored him beyond belief.
“Because you dared to ask it.”
She instinctively stepped back. His blank, unreadable eyes made her pulse race.
“I don’t understand.”
“You will… in time.” He pulled something from his jacket pocket.
A sheet of paper.
It was old—crumpled and worn, its ink faded from countless hands.
But the first line was still legible:
“13 Iron Rules of the Forbidden Aquarium.”
Praewa froze, eyes locked on the paper. She wanted to grab it—but her body wouldn’t move. It was as if something unseen had paralyzed her.
The second line began to blur—not because her hand was shaking, but because her vision was. Fear clouded her eyes. She drew a deep breath to steady herself and began reading the list:
Do not touch the glass.
Do not feed the fish.
Do not say the name of any creature aloud.
Do not retrace your steps.
Do not look into an empty tank.
Do not take photos or record video.
Do not ask about the past.
Do not remain alone.
Do not open closed doors.
Do not mention the outside world.
Do not touch the water.
Do not read the writing on the glass.
Do not challenge the rules.
“What... are these rules?” Praewa whispered, her heart racing. Goosebumps rose all over her body.
“They are your survival guide,” he replied.
“Survival guide?”
“But no one has ever survived.”
His words made the room feel deathly cold. Those words—“no one has ever survived”—echoed in her head. If no one had ever survived... then what chance did she have?
He turned his back on her and walked away without a second glance.
“Meet me at the lobby,” he said quietly, still facing away. “When everyone has arrived... and when you decide to break the rules yourself.”
Then he was gone.
Praewa remained alone with the massive aquarium and the eerie silence. She looked up at the glass again.
Her reflection had changed.
It was smiling.
But she wasn’t.
Her eyes widened in horror. She raised her hand to her lips, confirming that she wasn't smiling at all. Yet the reflection continued to grin back—mocking, unnatural.
And then… a sentence began to appear, like silver ink rising from beneath the surface of the water inside the massive tank:
YOU ARE ALREADY ONE OF US.
The reversed message on the aquarium glass had disappeared, but its meaning remained etched deep in everyone’s memory.“We remember everything, but no one lets us speak.”Everyone began to question what it meant. Was someone forbidden from revealing the truth about this place? It seemed as though whatever had disappeared was trying to return—through those upside-down letters. Someone here knew exactly what the message was trying to say. And that someone was likely none other than Praewa.She stood silently before one of the aquarium tanks. Dim lighting from within cast soft shadows across her face. Looking closely, one could see the emptiness in her eyes—no emotions, no clues as to what she was thinking or feeling. Slowly, tears began to well up in her eyes.
No one talked about what happened to Praewa anymore. It wasn’t because they didn’t want to—it was more because no one dared to. Ever since the aquarium had projected her past, the whole room had fallen into a state beyond explanation. It seemed the system itself didn’t want an explanation either. It only wanted everyone to remember things the way it chose.Ton stood quietly near the innermost wall of the room. He was a tall freelance photographer, wearing a simple brown hoodie and holding an old mirrorless camera fitted with a manual lens—his favorite piece of gear. The downside of that beloved camera was that it couldn’t connect to Wi-Fi or the cloud, and it had no wireless functions at all.Ton used to see that as a disadvantage, but bein
The aquarium’s announcement ended, leaving behind complete silence. Tension gripped every face in the room, and all eyes turned to James—accusing, as if silently blaming him for the recent chaos, second only to Ploy. But James paid them no mind. His thoughts remained fixated on the whisper that had told him not to fear the system’s voice… but to fear what was behind the system.What did that even mean?He pondered deeply. The whisper had claimed he had been here before—something that made no sense at all. James was certain he had never set foot in this place. And yet, the haunting familiarity and fragmented memories that flashed into his mind made him doubt himself.
After the strange incident with Ploy and the spiderweb-shaped cracks still visible on the glass of the massive tank, the remaining eleven participants in the lobby stood in silent unease. No one dared mention her name, as if speaking of someone who had broken an iron rule—and was now facing punishment—might somehow draw the same fate upon themselves.Everyone distanced themselves from Ploy, retreating to find their own space. She was left alone with her fear. Though Kawin and Praewa showed some concern for her, it was clear that they too were wary of getting too close. One by one, the group spread out across the room.James sat in the co
The image of the cracked glass with a mysterious wet handprint cast a heavy silence over the room. Everyone froze, unable to move, too stunned to even speak. The silence now felt heavier than any noise that had come before—so absolute, you could hear every breath.The wet handprint on the glass remained. It showed no signs of drying, even though, under normal conditions, a human hand’s moisture would have begun to evaporate by now.Ploy, the quiet young woman in a university uniform standing closest to the tank, hadn't spoken a word since arriving. But now—she was staring at something inside the aquarium, something that seemed… familiar.It struck a chord in her, as though she had seen it before but couldn’t recall when or where. She became entranced. Her gaze was fixed, her expression blank—but her eyes gleamed with an odd fascination.“Ploy…” Praewa called gently.Ploy didn’t respond. Her hand slowly rose toward the tank, her fingertips coming within a centimeter of the glass. She s
“Don’t… touch… the glass…”The voice came from inside the aquarium. Everyone heard it, yet no one was certain whether it had actually been spoken aloud or imagined. It wasn’t a sound that traveled through the air—it resonated directly through their nerves, like a whisper injected into their minds.Miki instinctively recoiled, stumbling over a chair and collapsing to the floor beside her broken phone. For a moment, the screen flickered one last time, replaying the footage she had just recorded, before finally fading to black—as if the device had never been powered on.“There really is something in there…” she whispered, pale and shaking with fear.Then, the speakers came to life once more—but this time, the voice was different.“WELCOME TO LUCID OCEAN. You are the 12 chosen, here to observe... or perhaps, in the end, to become the ones observed.”The announcement wasn’t spoken in a typical AI voice. It had a strange emotional undertone, something disturbingly human. Not robotic, not sy
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