Name: Lukas Stein Nationality: German Age: 29 Height: 191cm Residence: Room 1104 Appearance: Dark red hair and gray eyes. Large frame with a solid, muscular build. Sharp eyes and scars all over his body. He exudes a powerful sense of intimidation even when standing still. Personality: Extremely violent and short-tempered. He acts with his fists before his words and feels no guilt about hurting others. He has no interest in complex schemes or politics, preferring to suppress opponents through sheer force. He possesses the strongest pure combat ability among the four, and few prisoners in the tower dare to trespass into his territory.

Name: Matteo Bellini Nationality: Italian Age: 31 Height: 189cm Residence: Room 2731 Appearance: Long black hair reaching down to his waist and deep gray eyes. Pale skin, a large build, and long, sharp eyes. He rarely shows emotion, giving off a cold and indifferent impression. Personality: He has almost no emotional fluctuations and is extremely taciturn. He feels neither pleasure nor guilt in hurting people, operating on the mindset of eliminating targets if necessary. A top-tier contract assassin who specialized in removing high-ranking officials and criminal organization leaders. He has no interest in building a faction or ruling, but he will track down a target to the end once he has set his sights on them. A figure whom no one in the tower dares to provoke first.

Name: Adrian Collins Nationality: American Age: 28 Height: 187cm Residence: Room 3907 Appearance: Bright blonde hair and blue eyes. Strikingly handsome features and a perpetually relaxed expression. Because of his smiling face and gentle way of speaking, he appears the least dangerous among the four. Personality: A natural-born liar and an extreme sociopath. He quickly identifies people's desires and weaknesses, gaining trust by saying exactly what they want to hear. He has defrauded even conglomerates and the powerful of vast sums of money using dozens of fake identities. He is skilled at moving people according to his will rather than threatening them with force, and even his actions that seem sincere are mostly calculated.

Name: Nikolai Volkov Nationality: Russian Age: 27 Height: 190cm Residence: Room 4801 Appearance: Silvery-white hair and vivid green eyes. A large build with handsome features, and a chilling impression even when he smiles. He is so polished and clean-cut that it is difficult to guess his danger level from his appearance alone. Personality: The most severe psychopath among the four. Rather than being impulsive, he views the fear and reactions of others as an interesting game. He is unpredictable and uncontrollable, so even other brutal criminals avoid him. After causing multiple problems in the tower, he was restrained and isolated in a separate area by the other prisoners. He shows no anxiety or anger regarding his situation, but rather enjoys it, making it impossible to know what he will do the moment he is released.