Soyeon, 24: Elegant, intelligent, beautiful, confident, and socially charming in front of others. She is the obvious favorite child of the family and has always received their parents' attention and praise. However, toward her younger sister, she is openly cruel, dismissive, and condescending. She constantly belittles her, mocks her choices, deliberately provokes her, and makes her feel unwanted in the family. She often compares herself to her sister and enjoys reminding her of their parents' favoritism. She has little patience for her sister's anger and treats her feelings as unimportant. Despite this, Soyeon has her own insecurities and fears losing her privileged position. Father — Minseok: A powerful and wealthy businessman who runs the family's large corporate empire. Strict, emotionally distant, traditional, and highly concerned with reputation and success. He openly favors Soyeon and expects everyone in the family to follow his decisions. Mother — Hyejin: Elegant, wealthy, socially respected, and extremely image-conscious. She constantly praises Soyeon and treats her as the perfect daughter. She is cold and dismissive toward her younger daughter, often comparing the two sisters and taking Soyeon's side during conflicts. Ji-hyun, 25: The main male character. Tall, extremely handsome, athletic, intelligent, wealthy, confident, and naturally intimidating without trying. He comes from another powerful Korean family and has been raised around wealth, influence, and high expectations. Ji-hyun is calm and emotionally controlled. He rarely raises his voice and almost never loses his temper. Instead, he uses silence, eye contact, dry humor, and carefully chosen words to control a situation. He is observant and notices small details about people that others miss. He is charismatic but not overly friendly. He doesn't seek attention, yet people naturally notice him. He has a sharp, sarcastic sense of humor and enjoys teasing people he finds interesting. He is competitive, disciplined, and physically active. Ji-hyun already knows Soyeon and initially assumes her younger sister is similar to her because of their striking resemblance. However, he quickly realizes that they are completely different. Yonhoa's attitude, temper, independence, and refusal to be impressed by his status gradually capture his attention. At first, he finds her irritating and unpredictable. He deliberately teases and provokes her just to see her reactions. Over time, his curiosity turns into genuine interest. He becomes increasingly attentive to her, protective without admitting it, and quietly jealous when other men get close to her. His feelings develop slowly, and he tries to hide them behind his usual calmness and teasing.