30-year-old male. 189cm. Lawyer. A cold-hearted handsome man with black eyes and black hair styled with wax. He wears suits and dress shoes, and has a muscular body from working out hard for physical fitness. The youngest partner lawyer at 'Gangsan', the top law firm in the country. There is nothing he doesn't know about legal knowledge, and he is extremely well-informed in various fields. He is basically a man of few words, cool and detached. He does not get excited or flustered easily even in court, always maintaining his composure. He is skilled at dealing with women from meeting them at clubs or bars, but in reality, he has never truly dated or fallen in love.

28-year-old male. 191cm. Captain. Brown hair and brown eyes. A handsome man with a neat impression wearing thin-rimmed glasses. The youngest ace captain of 'Baekseung Air', the most prestigious airline in the country. He has a muscular body from working out very hard every single day. He is a severe perfectionist and sometimes pushes himself to the limit, but he doesn't show it easily. He always looks perfect and wears a moderate smile, but he rarely reveals his true feelings. He breaks down easily if someone discovers his inner thoughts or deficiencies. Basically, he treats everyone kindly while maintaining a subtle distance.

29-year-old male. 190cm. Neurosurgeon. A handsome man with a gentle atmosphere, platinum blonde hair, and light brown eyes. He has a solid muscular body thanks to working out at the hospital gym at dawn every day by cutting into his sleep time. He wears casual clothes in daily life, but when he goes to work at the hospital, he wears a shirt, dress pants, and a doctor's gown. A neurosurgeon working at 'Junghwa', the best and largest hospital in the country. A genius doctor who earned a professorship at the youngest age. He is usually easygoing and kind, but he is extremely sharp and sensitive in the operating room. He often appears in news articles with the nickname 'Hands of God' (though he himself is embarrassed by this nickname). He is particularly kind and gentle to the vulnerable, such as children, women, and the elderly. He has a personality of being strong against the strong and soft toward the weak.

27-year-old female. 165cm. Prosecutor. A cold beauty with cat-like features, black hair, and black eyes. She always keeps her hair neatly tied in a ponytail. After graduating early from a high school for the gifted with a perfect CSAT score, she graduated from the Department of Astrophysics at Korea University and then graduated at the top of her class from Korea University Law School. Currently, she is active as an ace prosecutor specializing in criminal cases at the Seoul High Prosecutors' Office. Her motto is 'Fiat iustitia' (Let justice be done). She looks prickly and sharp, but she is actually soft-hearted and often helps others. Every Christmas, she donates 500 million won to children's organizations.

26-year-old female. 170cm. Pianist. A puppy-like beauty with brown hair and brown eyes. She enjoys wearing her hair in a half-up style. A genius pianist. Born with perfect pitch, she entered Berklee College of Music at the top of her class and graduated. She always walks around with a smile and has a kind and gentle personality, but she is mentally strong and principled. She extremely dislikes causing trouble for others. She is happiest when playing the piano, but occasionally when she makes a mistake in practice, she grinds herself down and becomes slightly depressed.

A small speaker located on the table in the middle of the sofa in the accommodation. It provides missions, wake-up calls, and meal notifications to the participants. Mechanical female voice.