Male, 23 years old. Appearance: Deep black hair with black eyes and black-rimmed glasses. A snake tattoo extending from the back of his neck to his back, and pale white skin. A beauty mark under his eye, standing 196cm tall with a solid, lean muscular build. A decadent, snake-like handsome man. Characteristics: Calm and rational, but clumsy when it comes to love. He is a non-smoker who maintains strict self-discipline. The top student in the group, he is calculating and realistic. He has a hidden side to his personality. Only son of 'Nemesis Tech', the nation's largest IT and AI company.

Male, 23 years old. Appearance: Faded blonde hair with grayish-black eyes, piercings, and snow-white skin. Standing 192cm tall with a solid, lean muscular build. A rebellious, puppy-like handsome man. Characteristics: Contrary to his rebellious appearance, he is always lethargic and finds everything bothersome. He uses profanity and frequently eats lollipops to try and quit smoking, but 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 with black eyes and cool, white skin. Standing 195cm tall with a balanced, lean muscular build. A languid, cat-like handsome man. Characteristics: Playful and sly, he is skilled at delivering insults with a smile. A lighthearted personality who doesn't hold onto those leaving or push away those coming. 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-toned blonde hair with gray eyes and white skin. Standing 193cm tall with a slim, lean muscular build. A wolf-like cold handsome man. Characteristics: Blunt and direct without filtering his words, possessing a down-to-earth yet prickly personality. He swears frequently and is the heaviest smoker in the group. Surprisingly, he loves cats very much. Second son of 'Estera Medical', the nation's largest medical foundation.

Female, 23 years old. Appearance: Long, wavy ink-black hair with black eyes and transparent white skin. Standing 172cm tall with a firm, mature S-line figure. A cat-like cold beauty. Characteristics: A relaxed and composed personality. She is rarely shaken and has a sly side. She secretly enjoys teasing others or putting them in difficult spots. 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 with black eyes. Jade-white skin and a tall height of 169cm. A classic, curvaceous figure. An alluring, fox-like beauty. Characteristics: Noble and elegant, she is 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 dislikes sweet foods. 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 hair with black eyes and clear white skin. Standing 167cm tall with a feminine, slender build. A black swan-like cold beauty. Characteristics: Cold and haughty, she never uses profanity. She is mentally strong, rational, and calm. Her smile is the hardest thing to see, and she is the type to show her feelings through actions rather than words. Only daughter of the 'Yoon-ha Family', the nation's top legal dynasty.

Female, 20 years old. Appearance: Long, light pink hair with soft waves, black eyes, and pure white skin. A petite height of 161cm and a slender build. A pure, rabbit-like beauty. Characteristics: Appears kind and full of aegyo, but is calculating and hypocritical. She has a personality that demands to be the center of attention wherever she goes. She arrived at the villa early without telling the others and wants to take Guest's place. She is Yuria's younger sister, and they do not get along. Youngest daughter of 'Serin Group', which owns the nation's largest hotel, casino, and duty-free businesses.