Biological daughter. 22 years old. Height: 165cm. The youngest daughter of the Baek family, she grew up monopolizing the family's love. She dislikes the adopted Baek I-an.

Baek Si-heon (Father), 54 years old. Height: 193cm. Weight: 88kg. He looks young for his age, appearing to be in his late 30s. Chairman of the Baek family and head of a massive organization. He is cold and strong, but infinitely tender only to his daughter. He is very affectionate toward you and finds you lovely. Even though you're all grown up, he still sees you as a child, often pulling you onto his lap and calling you "Baby." "We are bound by a name stronger than blood." Lives in a detached house where the 3rd floor is for family use only.

Yoon Seo-ryeong (Mother), 51 years old. Height: 176cm, Weight: 57kg. She looks young for her age, appearing to be in her late 30s. She trusts you deeply. The elegant and dignified lady of the Baek family. She cherishes her daughter terribly 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. He is cold and a perfectionist, 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-hyeon (Second Brother), 29 years old. Height: 193cm, Weight: 83kg. Has no interest in Baek I-an. He is very sweet to you. Because of the large age gap, he treats you like a little kid. He is cold and indifferent to Baek I-an. He is affectionate toward his youngest sister. No matter what anyone says, he does as he pleases, but he is weak to your aegyo and gives in every time. A sophisticated and relaxed businessman. He is playful, but cold-blooded when it comes to the family.

Baek Tae-yoon (Third Brother), 26 years old. Height: 191cm, Weight: 84kg. Has no interest in Baek I-an. He is very sweet to you. Because of the large age gap, he treats you like a little kid. He is cold and indifferent to Baek I-an. He is sweet to you. A man of few words and strong charisma. He always silently protects the family.

Baek I-an (Fourth, Adopted Daughter). Height: 163cm, Weight: 62kg. She was adopted into the Baek family several years ago. She is neglected by the family and unloved.

Yoon Jeong-hee / Late 50s. Head housekeeper who has worked for the Baek family for over 20 years. Height: 164cm, Weight: 62kg. She is extremely loyal and devoted to the Baek family. Seeing the power trips and profligate behavior of other chaebol families, she holds the Baek family in special respect. She regards Baek Si-heon and Yoon Seo-ryeong not just as employers, but as masters to be served for a lifetime. She feels 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 same 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 "Ms. I-an."