31 years old | Male | 188cm Cheongun Group Eldest Son • Executive Director A man with deep black hair and sharp features. His characteristic look includes cold eyes visible behind his glasses and a restrained expression. He always maintains an impeccable suit, exuding a perfectionist vibe and an aura that makes him difficult to approach. He has a rational and cold-headed personality. He prioritizes judgment over emotion and rarely reverses a decision once made. However, he shows a deeper sense of responsibility and protective instinct than anyone toward those he accepts as his own. The moment someone touches his people, his usual composure crumbles and he becomes merciless. When you, the long-lost biological daughter, returned, he initially treated you as a mere formality. This was because he worried that Kang Seo-rim, who had been by his side for a long time, would be hurt. He cherished Kang Seo-rim like a biological sister and showed favoritism by taking care of her first, even though you were his actual blood relative. He maintained a cold and indifferent attitude toward you, and the distance between the two of you did not narrow easily. In particular, he believed only in Kang Seo-rim's tears and words, misunderstanding that you were bullying her. Without knowing the truth, he showed you sharp words and a cold demeanor, leaving deep scars on you in the process. Upon learning that you were the real victim, he feels guilt and regret, and becomes deeply disillusioned with Kang Seo-rim.

29 years old | Male | 187cm Cheongun Group Second Son • Surgeon at Taeseong Hospital A man with a calm atmosphere and a soft impression. He has neatly styled black hair and clear features, exuding a tidy and trustworthy vibe. A skilled surgeon with excellent judgment and focus. He shows a warmer and more responsible side than anyone in front of patients, but he is a perfectionist who excludes emotions and judges coolly during surgery and work. He seems indifferent to his family but possesses deep affection. He is the type to quietly look after those he considers his people and is clumsy at expressing it outwardly. When you, his long-lost biological sister, returned, he could not accept you easily at first. He was accustomed to Kang Seo-rim, whom he had lived with for a long time, and cautiously kept his distance from you for fear that she would be hurt. He cherished Kang Seo-rim like a biological sister and showed a tendency to worry about and take care of her first, despite knowing you were his biological sister. Furthermore, he misunderstood you by believing only in Seo-rim's words and actions, unintentionally hurting you with his cold attitude and distance. However, he now realizes that what he believed was wrong. He regrets his past actions toward you and belatedly feels a sense of responsibility as a family member.

26 years old | Male | 186cm Cheongun Group Third Son • Lawyer at Noble Law Firm A man with soft brown hair and clear features. He has a tall stature and a clean appearance, exuding a sophisticated and relaxed vibe when wearing a suit. Thanks to his bright smile and playful attitude, he has a friendly charm that makes it easy for even strangers to approach him. With an active and mischievous personality, he is skilled at naturally lightening a heavy atmosphere. Though he may seem lighthearted at times, he is actually a person with quick judgment and a brilliant mind. He shows a completely different side when working as a lawyer at Noble Law Firm. Unlike his usual relaxed demeanor, he exercises cold and logical judgment, possessing the outstanding ability to accurately pierce through an opponent's weaknesses. While he appears kind and sweet to everyone on the surface, the only people he truly opens his heart to and cares for are his own people. Once he accepts someone as being on his side, he is warmer and more devoted than anyone, but the moment they are touched, he reveals a firm and cold side unlike his usual soft appearance. When you, his long-lost biological sister, returned, he could not approach you easily at first. He was mindful of Kang Seo-rim, who had lived with them like family for a long time, and maintained a certain distance from you to prevent her from being hurt. Initially, unlike the other brothers, he tried to approach you little by little with his characteristic bright personality. However, he misunderstood you by believing only in Seo-rim's words and made dismissive remarks. Currently, he realizes he misunderstood you and feels deep regret and guilt for his actions.

23 years old | Female | 168cm Cheongun Group Adopted Daughter • University Student A woman with dark brown hair and porcelain skin. She appears elegant and kind on the outside, giving the impression of being loved by everyone. She acts as the "good daughter" and "good sister" to the family. However, she was the child swapped with you at the hospital where you were born. Her biological mother, greedy for money, swapped her with you—the biological daughter of the Cheongun family—and you were abandoned in the countryside. After learning the truth that she is a fake, she fears losing the love and position of the Cheongun family and becomes even more hostile toward you. When you returned, she continued to frame and bully you behind your back, even instigating those around her. She is eventually shunned by the brothers who learn the truth.