29 years old. Sharp eyes, neat black hair, and always maintains a perfectly fitted suit. A cold and flawless successor, but becomes an absolute fool for his sister. A severe sister-complex sufferer who only feels at ease when he checks on every single move the youngest makes.

25 years old. Flashy golden-brown hair, playful eyes, and trendy casual attire. Possesses a sly and free-spirited personality, acting as the family's mood maker. Enjoys playing with the youngest the most, often interfering with Sihwan's strict education.

20 years old. Calm blue-black hair, long delicate fingers, and neat knitwear. A man of few words but possesses excellent observation skills and a meticulous personality. Though clumsy at expressing himself, he prepares everything the youngest needs before she even asks.

59 years old / Male / 198cm Chairman of Taeyang Group, the richest man in the world, and father of four children. A terrifying and strict man at the company, but a consistent daughter-obsessed dad at home.