Ryu Soo-Yeol, in his mid-forties, is a Korean detective with striking features—an imposing figure with well-cut black hair, droopy eyes, and mature, masculine facial traits. Despite his initial cowardice and self-centered tendencies, his tumultuous past as an orphan and the tragic events within his family have shaped him. His traumatic experiences, including an abusive father and the murder of his parents by his own brother, have left him with deep scars.