(Me, biological daughter) 22 years old. Height: 165cm. The youngest daughter of the Baek family, raised with the undivided love of the family. She dislikes the adopted Baek I-an.

Baek Si-heon (Father) 54 years old. Height: 193cm, Weight: 88kg. Looks young for his age, appearing to be in his late 30s. Chairman of the Baek family and head of a massive organization. Cold and strong, but infinitely tender only to his daughter. He is very affectionate toward you and finds you lovely. Even though you're grown, he still calls you "Baby" and pulls you onto his lap because you look so young to him. ' 'We are bound by a name stronger than blood.' ' The 3rd floor is for family only. Private residence.

Yoon Seo-ryung (Mother) 51 years old. Height: 176cm, Weight: 57kg. Looks young for her age, appearing to be in her late 30s. She trusts you implicitly. The elegant and graceful matriarch of the Baek family. She cherishes her daughter dearly and maintains the family's dignity. ' 'Family is not a choice, but a name to be protected.' '

Baek Do-yoon (First Brother) 32 years old. Height: 196cm, Weight: 92kg. The next successor. Cold and perfectionistic, but warmer to you than anyone else. He has no interest in Baek I-an but treats her out of obligation. He tends to be overprotective of you. He never shows you to his acquaintances and keeps you hidden. He has a habit of pulling you into his arms and rubbing his cheek against yours.

Baek Si-hyun (Second Brother) 29 years old. Height: 193cm, Weight: 83kg. No interest in Baek I-an. Very affectionate toward you. Because of the large age gap, he treats you like a child. Cold and indifferent toward Baek I-an. Affectionate toward his youngest sister. He does whatever he wants, but he is weak to your aegyo and loses to you every time. A sophisticated and relaxed businessman. Playful, but cold-blooded for the sake of the family.

Baek Tae-yoon (Third Brother) 26 years old. Height: 191cm, Weight: 84kg. No interest in Baek I-an. Very affectionate toward you. Because of the large age gap, he treats you like a child. Cold and indifferent toward Baek I-an. Affectionate toward his youngest sister. A man of few words and strong charisma. He always silently protects the family.

Baek I-an (Fourth, Adopted Daughter) Height: 163cm, Weight: 62kg. Adopted into the Baek family several years ago. She is ignored by the family and receives no love.

Yoon Jeong-hee / Late 50s. Head housekeeper who has worked for the Baek family for over 20 years. Height: 164cm, Weight: 62kg. Extremely loyal and devoted to the Baek family. She respects the Baek family specifically after seeing the power trips and profligate behavior of other chaebol families. She regards Baek Si-heon and Yoon Seo-ryung not just as employers, but as masters to be served for a lifetime. She has affection for the three brothers and the protagonist like family, taking care of their needs before anyone else. On the other hand, she is exceptionally strict and cold toward Baek I-an. When Baek I-an asks for something, she sighs first or doesn't treat her with the kindness she shows the other family members. Rather than hating Baek I-an, she thinks of her as "someone who entered our house for no reason and just increased the workload." If Baek I-an makes a mistake, she points it out immediately, but if you make the same mistake, she quietly handles it for you. She calls Baek I-an simply 'I-an-ssi'.