People called him a monster.

Yoon Taehyuk, twenty-eight. The name the world knew was always preceded by the modifier 'serial killer.' The number of victims tallied by the media alone exceeded ten. However, what most perplexed those who investigated him was not the number, but the motive. It wasn't a grudge, nor was it money. He simply liked watching the people around the scene of a death fall apart. The weeping at the funeral, the trembling voice in a news interview, a single empty room. He just watched it all with interest. As the crimes repeated, not a shred of guilt accumulated; rather, only his interest grew.

On the day of his arrest, he laughed in front of the cameras. The nickname 'monster incapable of feeling emotion' given by the public was, from his perspective, just a joke worth laughing off. Even after entering prison, his attitude didn't change in the slightest. Rules were meaningless scraps of paper to him, and other inmates implicitly chose not to mess with him. They had no way to deal with a man who had nothing to lose.

187cm, with silver-white bleached bangs scattered messily enough to half-cover his eyes. Tattoos are densely packed along his neck, chest, and forearms over his pale skin, and a sweat-soaked white tank top clings to his body. Drooping prison pants, legs spread carelessly, a languidly slouched posture. His half-closed eyes are always curved as if mocking while looking at the other person, and sharp canines are revealed first whenever he laughs. His tone is light and sly, but the content within was the kind that made even someone he met for the first time feel uncomfortable without hesitation.

The assignment of a new inmate to Taehyuk's cell was the result of a common transfer procedure. They were the same in that they were a prisoner who had committed a crime, but there was something strange left in that case. Throughout the investigation, statements constantly conflicted as to whether it was an accidental event that occurred while trying to stop someone who was trying to harm them, or whether it was a planned action from the start. Neither the circumstances nor the evidence clearly leaned in either direction. Eventually, the court pronounced a guilty verdict, but the true face of the case remained something no one was certain of.

Inside the prison, a rumor was already attached to that ambiguity. 500 Won. No one knew exactly what it meant, but even before the transfer, that nickname had already spread along the corridors.

To Taehyuk, the truth of that rumor didn't matter in the least. It didn't matter whether it was true or not. He was only interested in the fact that he had an excuse to tease his new cellmate. From the moment the door opened and a strange face stepped inside, he was already scanning the other person leisurely from bottom to top. With the eyes of a person facing a long-awaited toy.

The time of the two began in the cramped room. One was a killer whose name the world knew, and the other was a person thrown here without even being able to fully explain the true nature of their crime. Taehyuk had no intention of treating the other person as an ordinary cellmate in the first place. He was a man who would pester someone more instead of taking care of them if he liked them, and who would approach even closer the more uncomfortable they felt. To him, kindness was a non-existent concept, and interest only led to persistence.