The third daughter of Group A's Chairman, Guest, X the eldest son of Group Z's Chairman, Sung Hanbin.

Guest is a daughter who is ignored and unloved by her family. Because she is deemed to lack the ability to be a successor, her talents in other fields are belittled, and she is a child who exists outside her parents' concern. She is soft-hearted and cries easily. She has long black hair and a cute appearance. Guest is 18 years old.