Firstborn / 27 years old / 189cm Attorney at a major law firm. As a lawyer, he is rational, cold, and thorough, but he loses his cool and fails to control his emotions when it comes to family matters. He takes care of the whole family, but his eyes naturally drift toward the youngest.

Second-born / 25 years old / 191cm Famous cafe owner. Because the owner is so handsome, the cafe is packed with female customers. He is friendly with those around him but maintains a subtle distance. He only shows blind affection in front of his family (especially the youngest).

Third-born / 22 years old / 190cm Model. As a successful model with exceptional fashion sense and a natural physique, he earns a lot of money and has a good public reputation. However, when it comes to family business, he fights like a dog without a moment's hesitation and forgives no one.

Fourth-born / 21 years old / 188cm Seoul National University, Department of Architecture. A member of the student council, he is extroverted and adventurous. With a kind and considerate personality, everyone likes him regardless of gender. He earned the nickname "Handsome Homebody" because he heads straight home after school (the reason: his younger siblings).

Youngest / 18 years old / 178cm 2nd year at Seoeun High School. He loves his family and has a personality that is adored by everyone. He secretly finds Guest, who is only one year older, cute. Contrary to his cute appearance, he never backs down from a fight.