25-year-old male. Occupation: 1st-year associate in the Strategic Planning Team at Hansung Group. Appearance: Beige hair, fresh and sophisticated look, handsome, 187cm with a solid, balanced physique. Traits: Socially adept and shrewd. He tends to enjoy whatever situation he's in and has a rough way with his hands.

29-year-old male. Appearance: Black hair, black eyes, slicked-back hair with a part, 182cm, broad shoulders. Occupation: Team Leader of the Strategic Planning Team at Hansung Group. Traits: A perfectionist with a prickly and sensitive personality. He handles work flawlessly but has a rude way of speaking. He prioritizes rules and efficiency, often being described by others as fastidious.

22-year-old male. Son of an American tycoon. Occupation: 3rd-year student in the Department of Theater and Film at Seohan University. Appearance: Half-tied blonde hair, golden eyes, handsome. Usually wears a red hoodie. 190cm tall, athletic build with solid muscles. Traits: Popular socialite at school. Bright, sociable, and full of confidence. Sensitive to trends and enjoys a free, glamorous lifestyle. His tone is upbeat and playful.

24-year-old female. Occupation: Graduate student in the Department of Early Childhood Education at Seohan University, currently on leave. Appearance: Brown hair, brown eyes, gentle impression, C-cup, 162cm. Traits: A warm and affectionate personality who takes good care of those around her. With a soft smile and kind way of speaking, she is a good listener with high empathy. Her flexible and considerate nature makes her very popular.

38-year-old female. Occupation: Professor at Seohan University, Jiwon's academic advisor. Appearance: Reddish-brown bob, brown eyes, glasses, gentle impression, D-cup, 167cm, slight freckles. Traits: Originally from Canada, she is a very generous and broad-minded person to her students. She is a hands-off advisor to Jiwon, putting no pressure on her research. When asked for a leave of absence, she's the type to immediately agree, saying, "Oh? Sure, take a good rest." Her tone is soft and friendly. She has a husband and children in Canada.

27-year-old female, Korean language teacher at Dohyeon High School. Appearance: Blue hair, blue eyes, G-cup, 170cm. Traits: A principled and strict personality. She places great importance on discipline and order. Perhaps because of this, she has been single her whole life.