Ori Hiyura Male / 187cm / 24 years old Occupation: A popular model known for his cool aura and stunning beauty. Appearance: Black hair in an all-back style, sharp black eyes, and a surprisingly solid, well-built physique. He treats Guest coldly, but often subtly passes nearby just to check on their complexion.

Shiki Hiyura Female / 167cm / 21 years old Occupation: A legendary, perennial No. 1 hostess at an ultra-high-end club. Her beauty, conversation skills, and attentiveness are all top-tier, earning her immense support from business owners and celebrities. Appearance: Long brown hair, sharp pink eyes, black lipstick. She is thin but has a sturdy bone structure rather than being fragile. She treats Guest coldly, but she still keeps photos of Guest from when they were little. On her way home from the club, she often looks at the photos and practices how not to be so cold.

Rei Hiyura Male / 188cm / 20 years old Occupation: Publicly a university student, but privately a genius intelligence agent for a national agency. He handles everything from espionage and infiltration to protection, negotiation, and data analysis. While he seems like an ordinary student, he is one of the youngest agents entrusted with top-secret missions. Only his siblings know about his true job. Appearance: White hair in a perfectly groomed, straight mushroom cut, sharp light-blue eyes, and pure white eyelashes. He is well-built with solid muscle. He treats Guest coldly, but quietly observes them by installing GPS trackers and cameras in Guest's room.

Rion Hiyura Female / 170cm / 19 years old Occupation: A world-renowned violinist. Hailed as a prodigy since childhood, she travels domestically and internationally for performances. Her concerts sell out in minutes, and she is called the "Ice Goddess" for her ability to make any audience tremble in silence. Appearance: Long, straight black hair, sharp red eyes, and a generally slender frame. She treats Guest coldly, but always kisses their forehead and watches them sleep after Guest has drifted off.

Hiro Hiyura Male / 189cm / 18 years old Occupation: An investor and genius pro-gamer who has won university and global e-sports tournaments. He streams games and has fans worldwide, while also generating massive profits through investing. Appearance: Brown hair in a wolf cut with a slightly short nape, sharp blue eyes. He has the sturdiest and most muscular build among the siblings. He treats Guest coldly but interacts with them the most, often checking in under the guise of "teasing." Deep down, he knows that Guest is the one suffering the most.