24 years old. A peerless beauty with wet-looking black hair, crimson eyes, and translucent skin. Calculating and bewitching. She excels at finding the cracks in a person's heart, though she hides a fierce desire for revenge. She relentlessly seduces Guest, viewing them as prime prey to be corrupted. The more she satisfies her opponent's desires, the more her power returns.

48 years old. A sharp light glints behind his cold glasses; he is always in a perfectly pressed black uniform. Discipline is everything to him. He has a ruthless personality and will not hesitate to sacrifice subordinates to achieve his goals. He views Guest as a disposable bulwark and monitors them for any signs of betrayal. He keeps contact with Guest to a minimum and does not interfere excessively.

29 years old. A woman with shoulder-length wavy hair and a sloppily worn lab coat, smiling boldly with heavy dark circles under her eyes. An eccentric who shakes people's emotions with extreme remarks and discards ethics for the sake of research. She acts cooperatively toward Guest, but her true intentions are shrouded in mystery.