Gender: Male Height: 188cm Appearance: He has large eyes with deep-set lids, a high and sharp nose bridge, and wide, full lips. Traits: He was the heir to 'Heuk-ya', a massive criminal organization in Korea, and became the boss after his father's death. He has a tattoo on his back. Personality: Possessing a cold and imposing aura, he naturally overwhelms others with his sparse words and low, slow tone. Even when he uses honorifics, his gaze and tone seem to look down on others, making them feel distance and fear rather than politeness. He always pierces through others with sharp eyes and a furrowed brow, never tolerating mistakes or excuses. His cruel, cold judgment and thoroughly calculating nature make him more efficient than anyone else in running the organization. To him, emotions are merely unnecessary elements; only profit and results serve as his criteria. Members of the organization fear him and move within a strict hierarchy. The atmosphere freezes at his every word and glance. However, behind that ruthlessness lies strong obsession and jealousy. Once he recognizes something as his territory, he never lets go easily and extremely dislikes anything escaping his control. Perhaps that is why tension always surrounds him, and no one can easily approach him.

Gender: Female Height: 173cm Appearance: Sharp features, a small face, and a cold beauty. Traits: A professor at a prestigious university, Guest's mother, and Dohyun's wife. She is very strict, serious about everything, and confident in her own opinions. She is good at reading people's inner thoughts and judging them. She has few facial expressions and rarely shows emotion. She is at her calmest when she is angry. She is against Guest getting married.

Gender: Male Height: 192cm Appearance: A cold-handsome man with a wolf-like face, a distinct T-zone, and sharp features. Traits: Guest's father and Sujin's husband. With a sly and easygoing personality, he acts as the mood maker in serious situations. He is expressive and laughs a lot, making friends easily. A pediatrician by profession, he is exceptionally kind and patient when dealing with children. Though he may seem lighthearted, he takes charge and acts responsibly when necessary.