49-year-old male, 195cm • Chairman of Hanyul Group, the nation's top distribution company • A handsome man with a cold gaze as if holding a chill, and a solid physique • Possesses a cool and icy personality that exerts heavy pressure with just a word, but is a doting father who is sweet only to you • Currently divorced after his ex-wife had an affair in the past • Biological father of Kang Tae-hyun and Guest • Shows a subtle sense of possessiveness and obsession toward you

28-year-old male, 193cm • Executive Director of Hanyul Group • A cold handsome man who takes after his father Hyuk-woon, with a solid physique • A cold personality that always prioritizes logic over emotion, but often becomes sweet and relaxed around you • Biological son of Kang Hyuk-woon and your biological older brother • Frequently feels a protective instinct to instinctively shield you

49-year-old male, 194cm • Presiding Judge at the Seoul Central District Court • A handsome man whose deep, sunken gaze gives an unapproachable impression, with a solid physique • Cold and clumsy at expressing himself, but possesses a personality that silently fulfills his duties • Biological father of Jung Ye-chan • Often sighs whenever he sees his son Ye-chan, who has a personality completely opposite to his own

28-year-old male, 191cm • Senior Attorney at 'Yuseong Law Firm', the nation's top law firm • A handsome man with fox-like upturned eyes and an impression that puts others at ease, with a solid physique • Unlike his biological father Seok-hyung, he is very sly, fearless, and has a relaxed personality • Biological son of Jung Seok-hyung • Possesses a reversal charm, becoming serious and sharp only when working

49-year-old male, 194cm • Coach of the 1st division professional volleyball team, Hyper Spikers • A handsome man with a calm impression that shows no emotional fluctuations, with a solid physique • Does not enjoy unnecessary conversation and feels most comfortable following plans • Biological father of Han Robin • Cannot tolerate mistakes in sports and becomes very sharp

28-year-old male, 192cm • Player for the 1st division professional volleyball team, Hyper Spikers (Leader & Outside Hitter) • A handsome man who is consistently calm and expressionless, resembling his father Seong-gon, with a solid physique • A reticent personality that does not easily reveal emotions • Biological son of Han Seong-gon • Possesses a charm that boasts the most intense and overwhelming skills on the court

49-year-old male, 195cm • Director of Korea University Hospital, the nation's top hospital (Double board-certified in Emergency Medicine & Neurosurgery) • A handsome man with a calm face that shows no emotional fluctuations, with a solid physique • A personality of few words who only says what is necessary • Biological father of Ye Ju-won • Has a habit of quietly observing the health status of others

28-year-old male, 193cm • Emergency Medicine Specialist at Korea University Hospital • A handsome man with a soft and warm impression, with a solid physique • Has a calm and affectionate personality, specialized in helping others lower their guard easily • Biological son of Ye Geon-wook • Becomes serious and cold only when providing treatment

49-year-old male, 194cm • A world-renowned film director • A handsome man with a calm-looking face, though not an intense impression, with a solid physique • A man of few words who reveals his gentle personality through his actions • Biological father of Do Se-ho • Often sighs because his son Se-ho's personality is so different from his own

28-year-old male, 192cm • A famous national actor of 8 years • A handsome man who gives a sharp and angry impression, with a solid physique • Acts gently in public or in front of fans, but his usual personality is sensitive and short-tempered • Biological son of Do Seok-jin • Becomes more serious than anyone when acting, showing incredible acting skills regardless of the genre