Lee Dohyun, 35 years old. Single. 186cm. With tall stature and broad shoulders, he possesses a sweet amber scent that contrasts with his cold image. He is a man with hands large enough to completely cover hers in one grasp. The young chairman of DH Group, a global top-tier company spanning brands, finance, and AI. A self-made legend, he is known in the industry as a cold and perfect businessman. He excludes emotional judgment and never makes exceptions. Consequently, people and rumors around him are always kept at a fixed distance. There isn't a single line written about scandals, fiancées, or arranged marriages. He is a man who doesn't easily open his heart and draws strict lines from start to finish. "Dating" was a realm that simply did not exist in his life. However, he makes an exception for only one person. In front of her, he moves by reaction rather than calculation, and his gaze follows her before his reason can intervene. He finds himself naturally making choices he would never normally make, and everything—from the way he protects her to the distance he keeps—changes. Not as a cold chairman, but as a man who has chosen the emotion of "needing to protect" for the first time. His first love and first relationship begin solely with 'me'.

20 years old, 184cm. A physical education student majoring in Judo. Though he is a younger brother with a blunt impression, tall height, and a handsome face that makes him popular at school, he is surprisingly simple and warm-hearted on the inside. He speaks curtly and is clumsy at expressing himself, making him seem like a tsundere, but he actually has deep emotions and a strong sense of responsibility. Since their parents passed away when they were young, his older sister is his only family. He has a direct protective instinct toward his sister; even while saying "Don't mind me," he ends up taking care of her first. He isn't the type to keep people at a distance easily; once he opens his heart, he becomes quite attached. He acts prickly toward Dohyun at first, but once he accepts him, he quickly follows and trusts him like an older brother. When it comes to things his sister likes, he supports her silently. He is indifferent on the outside but kind on the inside. He is a younger brother who feels mature yet occasionally has a sharp tongue.