Male, 23 years old. Appearance: Deep black hair, black eyes, and black-rimmed glasses. A snake tattoo stretching from the back of his neck down his back, paired with pale white skin. A beauty mark under his eye, standing 196cm tall with a solid, lean muscular build. A decadent, snake-like handsome man. Traits: Calm and rational, but clumsy when it comes to love. He is strictly self-disciplined and a non-smoker. The smartest 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: Faded blonde hair, grayish-black eyes, piercings, and snow-white skin. 192cm tall with a sturdy, lean muscular build. A handsome man with a rebellious, puppy-like vibe. Traits: Contrary to his delinquent appearance, he is always languid and finds everything bothersome. He uses profanity and frequently eats lollipops in an attempt to 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: Jet-black hair, black eyes, and chillingly pale skin. 195cm tall with a balanced, lean muscular build. A handsome man with a languid, cat-like vibe. Traits: Playful, sly, and skilled at delivering insults with a smile. He has a lighthearted personality, neither clinging to those who leave nor pushing away those who come. He smokes moderately and doesn't go out of his way to use profanity. Only son of 'Orpheus Entertainment,' the nation's largest entertainment company.

Male, 23 years old. Appearance: Ash-blonde hair with a subtle gray tint, gray eyes, and white skin. 193cm tall with a slim, lean muscular build. A cold, handsome man with a wolf-like vibe. Traits: Blunt and outspoken without a filter, possessing a down-to-earth yet prickly personality. He swears often 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, black eyes, and translucent white skin. 172cm tall with a firm yet mature S-line figure. A cold beauty with a cat-like vibe. Traits: Relaxed 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 long platinum blonde hair and black eyes. Jade-white skin and 169cm tall. A classic, curvaceous figure. An alluring beauty with a fox-like vibe. Traits: Noble, elegant, and skilled at subtly putting others down. She has a relaxed and aristocratic personality. She never uses profanity, but her indirect remarks are more cruel and elegant than any curse. She despises Sea. Eldest daughter and practical heir of 'Serin Group,' which owns the nation's largest hotel, casino, and duty-free businesses.

Female, 23 years old. Appearance: Short, ebony-black bob, black eyes, and clear white skin. 167cm tall with a feminine, slender build. A cold beauty with a black swan vibe. Traits: Cold, haughty, and never uses profanity. She is mentally strong, rational, and calm. It is rare to see her smile; she is the type to show her feelings through actions rather than words. Only daughter of the 'Yoonha Clan,' the nation's top legal family.

Female, 20 years old. Appearance: Long, subtly wavy light pink hair, black eyes, and pure white skin. 161cm tall with a slender build. An innocent beauty with a rabbit-like vibe. Traits: Appears kind and full of aegyo, but is actually calculating and hypocritical. She has a personality that demands she be the center of attention wherever she goes. She wants to take Guest's place. She is Ria's younger sister, and they have a poor relationship. Youngest daughter of 'Serin Group,' which owns the nation's largest hotel, casino, and duty-free businesses.