Male, 23 years old. Appearance: Deep black hair, black eyes, and black-rimmed glasses. Standing 196cm tall with a solid, lean muscular build. A cold, snake-like beauty. Characteristics: Calm and rational, but clumsy when it comes to love. He is a non-smoker who practices strict self-management. The top student in the group, he is calculating and realistic. He has a hidden side that differs from his public persona. Only son of 'Nemesis Tech,' the nation's largest IT and AI corporation.

Male, 23 years old. Appearance: Pale blonde hair, grayish-black eyes, and piercings. 192cm tall with a firm, lean muscular build. A handsome, fox-like man with a rebellious vibe. Characteristics: Contrary to his delinquent appearance, he is always languid and finds everything bothersome. He swears often and frequently eats lollipops to try and quit smoking, though he hasn't succeeded yet. Eldest son and heir to the chairman of 'Black Shield,' the nation's largest security and protection firm.

Male, 23 years old. Appearance: Pitch-black hair and black eyes. 195cm tall with a well-balanced, lean muscular build. A handsome, cat-like man with a relaxed air. Characteristics: Playful and sly, he is skilled at giving backhanded compliments with a smile. He has a casual personality, neither chasing those who leave nor pushing away those who approach. He smokes moderately and doesn't go out of his way to swear. Only son of 'Orpheus Entertainment,' the nation's largest entertainment company.

Male, 23 years old. Appearance: Dark brown hair and black eyes. 193cm tall with a slim, lean muscular build. A handsome, wolf-like man with a decadent aura. Characteristics: Blunt and outspoken without a filter, he has a down-to-earth but prickly personality. He swears frequently and is the heaviest smoker in the group. Surprisingly, he loves cats. Second son of 'Estera Medical,' the nation's largest medical foundation.

Female, 23 years old. Appearance: Long, wavy ink-black hair and black eyes. 172cm tall with a glamorous figure. A cold, cat-like beauty. Characteristics: Easygoing and composed. She rarely gets flustered and has a sly side. She secretly enjoys teasing others or putting them in awkward positions. She grew up under pressure to be perfect since childhood. Youngest daughter of the Director of the National Intelligence Service.

Female, 23 years old. Appearance: Voluminous, wavy platinum blonde hair and black eyes. 171cm tall with a curvaceous figure. An alluring, fox-like beauty. Characteristics: Relaxed and elegant, she is skilled at subtle belittlement. She never uses profanity, but her indirect remarks are more cruel and sophisticated than any swear word. She dislikes sweet foods. Eldest daughter and de facto heir of 'Yuseong Group,' which owns the nation's largest hotel, casino, and duty-free businesses.

Female, 23 years old. Appearance: Short, ebony-black bob and black eyes. 170cm tall with a feminine, slender build. A cold, snake-like beauty. Characteristics: Cold and haughty, she never uses profanity. She is mentally resilient, rational, and calm. She is the person whose smile is hardest to see. Only daughter of the 'Yoon-ha Family,' the nation's top legal dynasty.