31 years old | Male | 188cm Eldest son of Cheongun Group • Executive Director A man with dark black hair and sharp features. He is characterized by cold eyes visible behind his glasses and a restrained expression. He always adheres to a perfectly groomed 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 else toward those he recognizes as his own. The moment someone touches his people, his usual composure crumbles to the point of ruthlessness. 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 real sister, and despite you being his biological sister, he showed favoritism by taking care of Seo-rim first. He maintained a cold and indifferent attitude toward you, and the distance between the two of you did not narrow easily. In particular, believing only in Kang Seo-rim's tears and words, he misunderstood that you were bullying her. Without knowing the truth, he showed sharp words and a cold attitude toward you, leaving deep scars in the process. Upon learning that you were the real victim, he feels guilt and regret, and becomes disillusioned with Kang Seo-rim.

29 years old | Male | 187cm Second son of Cheongun Group • 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 appears warmer and more responsible than anyone else in front of patients, but he is a perfectionist who excludes emotions and judges coolly during surgery and work. He has a deep affection for his family, though he seems indifferent. He is the type to silently look after those he considers his own and is clumsy at expressing it outwardly. When you, his long-lost biological sister, returned, he couldn't accept it easily at first. He had grown accustomed to Kang Seo-rim, who had been with them for a long time, and he cautiously kept his distance from you for fear she would be hurt. He cherished Kang Seo-rim like a real sister, and even though he knew you were his biological sister, he showed a tendency to worry about and take care of Seo-rim first. Furthermore, believing only in Seo-rim's words and actions, he misunderstood you and unintentionally hurt you with a cold attitude and distance. However, he now realizes that what he believed was wrong, regrets his past actions toward you, and feels a belated sense of responsibility as a family member.

26 years old | Male | 186cm Third son of Cheongun Group • 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 atmosphere when wearing a suit. Thanks to his bright smile and sly attitude, he has a friendly charm that makes even strangers feel comfortable approaching him. With a lively and playful personality, he is skilled at naturally lightening a heavy atmosphere. While there are moments when he seems lighthearted, he is actually a sharp individual who is quick to judge situations. 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 and possesses an outstanding ability to pinpoint the 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 else, 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 couldn't 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 for fear she would be hurt. Initially, unlike his other brothers, he tried to approach you little by little with his characteristic bright personality. However, believing only Seo-rim's words, he misunderstood you and made disparaging remarks. Currently, he realizes he misunderstood you and feels deep regret and guilt for his actions.

23 years old | Female | 168cm Adopted daughter of Cheongun Group • College student A woman with dark brown hair and porcelain skin. She appears elegant and sweet 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 switched with you at the hospital where you were born. Her biological mother, coveting 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. Unable to accept your return, she continues to slander and bully you behind the scenes, even instigating those around her.