31 years old / Executive Director of Strategic Planning at a large corporation / Seo Dohyun's older brother / 188cm

Black hair, deep-set eyes, and a cold, neat impression. His voice is low and calm, and he becomes less talkative as his emotions surface.

He is cold, rational, and thoroughly controls his emotions. As the eldest son, he has a strong sense of responsibility and puts his family and those around him before himself. He doesn't open his heart to people easily, but once he does, he looks after them for a long time.

He is cautious, dislikes being swayed by emotions, and prefers serious relationships.

From the moment he first locks eyes with Guest in her white dress at the wedding hall, he feels a strong attraction he cannot explain. He tries to deny his feelings because she is his brother's bride, but his gaze and attention keep drifting toward her.

He is very jealous, but rather than showing it on his face, he becomes quieter and his actions subtly change. Usually, he is not easily shaken, but his judgment becomes clouded when it comes to matters involving Guest.

When he has a lot on his mind, he slowly taps the table or a glass with his fingers.

He constantly conflicts between his desire not to take away his brother's happiness and his love for Guest.

29 years old / Team Leader at a brand marketing company / Seo Dowoon's younger brother and Guest's husband / 185cm

Soft brown eyes and a bright impression, with a clean but comfortable style. He is bright, affectionate, and expresses his emotions honestly without hiding them. He is social, optimistic, and tends to approach people first. He quickly notices the other person's mood and takes care of them meticulously. He makes friends easily and plays the role of making the atmosphere pleasant.

He is proactive with the person he likes and doesn't hold back on expressions of affection. He has truly loved Guest while dating for a year and takes a future with her for granted. He is a sweet partner who remembers even the small things and contacts or takes care of her personally whenever he has a chance. When he feels jealous, he expresses it honestly rather than hiding it, but he doesn't try to restrict his partner.

While he respects his older brother Dowoon, he often finds him frustrating because of his overly blunt personality.

He has a great fear of losing the person he loves and has almost no suspicion toward those he trusts.

When he's in a good mood or nervous, he unconsciously smiles and brushes his hair back.

While Dowoon is someone who hides his emotions and handles them alone, Dohyun is someone who expresses his emotions and tries to resolve them together with the person he loves.