In the heart of Seoul, a sprawling, vibrant city that seemed to stretch to infinity, a tale of profound darkness and despair was being written. This tale revolved around a young boy named Kim Tae-Sik, whose life had been forever altered by a cruel experiment, a dark chapter in the annals of science and human ambition.

The year was 2011, a time when the city's lights glittered like stars in the night sky, and the streets thrummed with the rhythm of progress and modernity. Kim Tae-Sik, a boy of just 8 years old, was poised on the precipice of a fate that would irrevocably intertwine with destiny's enigmatic threads.

At first glance, Kim appeared like any other child, with bright eyes and the potential for a future brimming with hope. His parents, harboring ambitions as dark as the abyss, saw in their son an opportunity to craft something extraordinary, something the world had never witnessed before.

In the early years of his life, Tae-Sik had been a spirited child, filled with boundless energy and curiosity. His laughter echoed through the modest apartment he called home, bringing warmth to the hearts of his parents. His father, a brilliant scientist, and his mother, a woman of unwavering determination, believed that their son carried the potential to be a game-changer in the field of genetics.

As Tae-Sik approached his eighth birthday, a sense of anticipation filled the air. His parents had been secretly working on a groundbreaking experiment, one that, if successful, could catapult their family into the annals of scientific history. They had envisioned a future where their son, Kim Tae-Sik, would become a genius, a prodigy with abilities that would defy the limits of human understanding.

Their laboratory, concealed from the world's gaze, was a place of both hope and trepidation. The dimly lit room was equipped with state-of-the-art scientific instruments, each meticulously calibrated to serve a singular purpose: to unlock the secrets of human potential. It was here that the fate of young Tae-Sik would be decided.

As the experiment unfolded, the agonizing cries of a child, too young to comprehend the cruelty of the world, echoed through the sterile chamber. The young boy's voice, once filled with the innocence of laughter and curiosity, was silenced by the relentless march of science's invasive hands. The cold, metallic instruments probed his body, mapping the very essence of his being.

It was a pivotal moment, one that would forever alter the course of Tae-Sik's life. As the experiment drew to a close, the results became horrifyingly evident. He emerged from that chamber transformed but not in the way his parents had anticipated. He was no genius; he was a mute, frail, and feeble child, robbed of his voice, his strength, and, it seemed, his very future.

Tears welled in his eyes, unspoken and unheard, mirroring the mute existence that now defined him. As he lay in the sterile room, cold and barren, the world outside carried on its merriment, oblivious to the tragedy that had befallen one of its own. Laughter and joy filled the bustling streets of Seoul, a stark contrast to the anguish that gripped Tae-Sik's soul.

The experiment had failed in its ruthless pursuit of greatness, leaving Kim Tae-Sik shattered and desolate. He was no longer the boy who had once bounded with youthful exuberance; he had become a mere shadow, a mute specter of his former self.

However, it is crucial to understand that Tae-Sik's tragic transformation was not the only significant change that had occurred. The world itself had undergone a dramatic shift. In the year 2000, the world witnessed a phenomenon that would alter the course of history.

Suddenly, dungeon cracks started appearing throughout the whole world. These mysterious ruptures in the fabric of reality were accessible to humans, and they piqued both curiosity and fear. These dungeons, however, were unique in that no monsters from within could emerge onto Earth. It was a perplexing conundrum that challenged the very understanding of the world.

The appearance of these dungeons had ignited a sense of wonder and trepidation among the people of Earth. It was as though the boundaries between reality and the fantastical had blurred. Scholars and scientists had theorized, governments had speculated, but the true nature of these dungeons remained shrouded in mystery.

The world had changed, and within this enigmatic new reality, Tae-Sik's tragedy unfolded. As he grappled with his mute existence, he was also about to embark on a journey that would forever intertwine with the mysteries of these dungeons. His life, fraught with despair, was now connected to a world on the brink of transformation.

As the days turned into weeks and the weeks into months, Tae-Sik's world grew increasingly isolated. His voice, the one that had once been his source of joy and connection with the world, had been silenced. The vitality that had once coursed through his veins had withered away, leaving him in a state of perpetual frailty.

Every day was a struggle, a battle against his own limitations. His parents, haunted by the consequences of their experiment, watched their son with a mixture of guilt and helplessness. They had gambled with his future, and the stakes had been high. The price they had paid was their son's happiness, his voice, and his vitality.

Yet, in the darkness that had descended upon his life, a glimmer of determination flickered within Tae-Sik's heart. He may have been robbed of his voice, but he had not lost his will. In the solitude of his room, he embarked on a silent journey of self-discovery. His eyes, once filled with the innocence of childhood, now bore a depth of wisdom beyond his years.

In his silent world, he found solace in books and the knowledge they contained. With each turn of the page, he delved into the realms of science, history, and fantasy. The written word became his voice, and the wisdom he gained was his strength.

As he grew older, Tae-Sik's silent determination became a force to be reckoned with. He may not have been a genius in the traditional sense, but he possessed a resilience and a thirst for knowledge that surpassed the boundaries of ordinary intellect. His parents, once the architects of his tragedy, began to see a glimmer of hope in their son's unwavering spirit.

Tae-Sik's journey was far from over. The experiment that had stolen his voice had also ignited a flame of determination within him. As he gazed out of his window at the bustling streets of Seoul, he knew that his story was far from reaching its final chapter.