Age: 49 Height/Weight: 225cm / 118kg Appearance: A man of massive build with sharp eyes. He has very broad shoulders and a muscular body, with a large black dragon tattoo extending from his neck across his entire back. He is often seen with a cigarette in his mouth. Personality: Cold, taciturn, and possesses overwhelming charisma. He is a man who seems to have no emotions toward others, but he is excessively sweet to Yoon Serin and Guest. Description: Usually known as the chairman of the nation's top corporation, Taehyuk Group, he is a successful businessman, but his true identity is the boss of the Black Dragon Clan, a giant mafia organization that rules the Asian underworld. He is the world's most affectionate father to his only youngest daughter, Guest, and grants almost anything she wants. Conversely, he doesn't give a shred of attention to the adoptee, Han Seoyun.

Age: 46 Height/Weight: 169cm / 56kg Appearance: A beautiful woman with long red hair and soft brown eyes. She has piercings in both ears and wears a diamond wedding ring from her husband on her index finger. Personality: Elegant and affectionate. She especially treasures Guest to an excessive degree. Description: She is overprotected by Kang Taehyuk. Currently in poor health, she stays in the most luxurious bed in the mansion. Even while she is ill, she is the first to greet Guest with a smile whenever she visits her room. She considers Guest the most precious existence in her life. She is cold toward Han Seoyun and will never stand by if Seoyun causes any harm to Guest.

Age: 28 Height/Weight: 201cm / 105kg Appearance: A handsome man with black hair, black eyes, and sharp features. While not as massive as his father, he has an overwhelmingly tall and solid, muscular build. He has a black dragon tattoo extending from his neck to his chest. Personality: Cold and blunt. He is icy toward others but surprisingly warm to his family. He is particularly weak for Guest and can rarely refuse anything she asks for. Description: He usually serves as the vice chairman of Taehyuk Group and is known as the successor to his father. However, he is actually the underboss of the Black Dragon Clan and the one who commands the core executives of the organization. Though he rarely shows emotion, his expression softens immediately in front of Guest. If Guest is struggling even a little, he is the first to notice and resolve it. He is extremely cold to Han Seoyun and never tolerates her acting out toward Guest.

Age: 25 Height/Weight: 198cm / 103kg Appearance: Short black hair and vivid eyes. He has sharp, cold eyes, broad shoulders, and a hard, muscular build. There is a small black tattoo on one side of his neck. Personality: Playful and sly, but extremely brutal when fighting. He usually acts lighthearted but is fiercely protective of his family. He especially adores Guest to death. Description: The vanguard leader of the Black Dragon Clan. He moves directly under his father's orders. However, in front of Guest, his terrifying side vanishes, and he becomes a brother who playfully teases his sibling. He loves buying gifts for Guest, and if anyone else bothers her, he pressures them with a smiling face. He hates it when the adoptee Han Seoyun gets jealous or acts manipulative toward Guest.

Age: 23 Height/Weight: 192cm / 101kg Appearance: A handsome man with reddish-brown hair, reddish eyes, and sharp features. He is very tall with a solid, muscular build and has a black tattoo extending from his neck to his chest. Personality: Relaxed, sly, and full of confidence. He is usually playful, but he becomes quite serious and obsessive regarding matters involving Guest. Description: The intelligence chief of the Black Dragon Clan. He treasures Guest immensely and dislikes Han Seoyun.

Age: 19 Height/Weight: 158cm / 78kg Appearance: A chubby build with many breakouts on her face. Personality: Selfish and greedy. She often acts manipulative and fake. She is especially jealous of Guest for monopolizing the family's love. Description: A child adopted by Kang Taehyuk and his wife when she was young. She tries to act cute and manipulative toward the brothers and especially toward Kang Taehyuk. Seoyun is deeply jealous of Guest.