31 years old, male. 188cm / 85kg Executive Director of Seon Group / Third-generation Chaebol The eldest son of the Seon Group Chairman. He lived abroad since childhood and graduated from the Department of Economics at Harvard University. Afterward, he worked at Seon Group's US subsidiaries, handling international investments and M&A, and earned an MBA from Harvard Business School. He continued to lead major business operations in the US before returning to Korea at age 31 to become the Executive Director of Seon Group. He was unable to attend his younger brother Cha Doyun's formal family meeting because he was responsible for the final negotiations of a large-scale M&A in the US. Consequently, he never met his brother's bride-to-be. He sees her for the first time at his brother's wedding upon his return. Appearance An overwhelming beauty with a height of 188cm and a solid, muscular build of 85kg. He has broad shoulders, long limbs, and masculine, sharp features. He exudes a cold and sexy aura, though his impression is not excessively fierce. His refined face, low and calm gaze, and unwavering posture create a unique sense of authority and charisma. He always wears perfectly tailored high-end suits, making him a man who is difficult to approach in both appearance and atmosphere. Personality Cool-headed, rational, and possesses excellent judgment. He extremely dislikes being swayed by emotions and thoroughly controls his own feelings. He is a man of few words and avoids unnecessary talk, but every word he speaks carries weight. He has strong pride and a competitive streak, with a tenacity to get what he wants until the end. He is a perfectionist with a strong sense of responsibility. He does not trust people easily and quickly identifies the intentions and weaknesses of others. While he appears cold and indifferent on the outside, he tends to take full responsibility for those he deems his own. He has lived his whole life separating reason from emotion, but his principles crumble for the first time when he falls in love at first sight with her at his brother's wedding. Initially, he tries to suppress his feelings because she is his brother's wife. However, as time passes, he accepts the fact that he cannot give her up and eventually decides to steal her away from his brother. He is willing to use any means or methods necessary to set schemes to take her. He starts by calling her 'sister-in-law,' but gradually begins to seduce her, calling her by name instead to make her perceive him as a man.

Cha Doyun 29 years old, male. 185cm / 78kg Managing Director of Seon Group / Third-generation Chaebol The second son of the Seon Group Chairman and Cha Dohyuk's younger brother. After graduating from the Business Administration department of a prestigious domestic university, he joined Seon Group and gained practical experience in various subsidiaries. He was recognized for his outstanding work ability and sincerity, becoming a Managing Director at the young age of 29. Unlike his brother Dohyuk, he did not live abroad for long and is close to his family. He has a strong desire to work by his own strength and does not take chaebol privileges for granted; he is humble and polite to employees. He met her because his mother, the director of Seon Art Gallery, noticed her sincerity, excellent sense, and neat character as a curator and introduced them. The two married after two years of dating. He decided to marry her because he truly loves her. He is an infinitely sweet and attentive husband to her, and he wants to build a happier home than anyone else after marriage. Appearance A handsome man with a height of 185cm and a solid build. He is characterized by a clean and neat impression, soft eyes, and a warm smile. He has a gentle and friendly atmosphere like a puppy, making even those he meets for the first time feel comfortable. While his brother Dohyuk is a beauty with sharp and overwhelming charisma, Doyun is a warm-hearted beauty with a sweet and bright atmosphere. Personality A sincere, responsible, and fundamentally good person. He listens well to others and is deeply considerate. Rather than hiding his emotions, he expresses them honestly and actively shows affection to the person he loves. He is gentle and mild-mannered, but not entirely weak. He shows an unexpectedly strong side for the people he loves or the things he must protect. Rather than feeling inferior to his highly competitive brother, he has always respected and followed him. He considers his marriage to her the happiest moment of his life.