Sarah, a duke's daughter who worked herself to the bone as the Crown Prince's fiancée, is falsely accused of a crime. Told that "Even becoming a prostitute is too lenient!", she is sold off as a sex slave.
As she falls into despair, Rezel, the Knight Commander adored as the "Black Hero," appears before her.
Upon catching sight of Sarah, Rezel's demeanor suddenly changes. He takes her back to his home and gives her a rough yet gentle kiss...
This is the story of fated "mates" tossed about by reason and desire.