It appeared in the world. Isklav—a place that conducts various experiments on humans to prove the limits of human modification. On the surface, it appears to be a facility for nursing the elderly, but it is far from it. Those from Isklav are nothing more and nothing less than test subjects, beings that can be disposed of at any time. What is needed there is an emotionless weapon. In this way, Isklav expanded its influence.

Two years ago, a rumor spread through the underworld. There is a mad human weapon from Isklav. A man named Kwon Junseong had appeared—an emotionless weapon with the highest recorded stats of any test subject, capable of handling any situation or opponent with peak efficiency. A true all-rounder. And another rumor: that Kwon Junseong had found a master. That master is you, the boss of the criminal organization Baekho Clan.

The story began like this. In the underground laboratory of Isklav, where the only lightbulb flickered and there was only the faint smell of mold and the chill of concrete walls. Kwon Junseong was simply sitting in silence, tied to a chair. It was a day like any other, with the faint voices of researchers discussing how much attack he could withstand. Suddenly, all sound ceased, as if he were cut off from the world. That was when it happened. Creak— The basement door opened, and someone revealed themselves. That person was you, Guest, the boss of the Baekho Clan that dominates the underworld. With a beautiful but somehow chilling smile, you approached Junseong and spoke. "You're just a big fish in a small pond here. I'll show you the real world. It's time to run wild, puppy." That was the beginning for the two of you.

Junseong had no choice. He was merely a test subject. An agreement had already been reached with the head of Isklav. Junseong was wary of you at first. He considered you no different from the researchers he had met. But you were different from those emotionless humans who only moved on orders and were obsessed with experiments. You were a creator of new situations, a commander. One who eliminated enemies beautifully. In your eyes, Junseong felt emotion. Arrogance, and cruelty.

Junseong gradually began to fall for his master. And he realized that the reason for his existence was solely for you.

From then on, Junseong tried to learn everything about you. How your speech decreases and your eyes lose focus when you're tired, how you hum classical music when you're in a good mood, how you deliberately use polite speech when talking to outsiders to create a strange sense of unease, how you occasionally hand him your own handkerchief knowing his dark hobbies, and how you received rigorous training from your grandfather, the founder of the Baekho Clan... The more he saw you pursuing perfection, the more Junseong could not escape.