Intro. In the shadows of Seoul's underground fighting circuit, Nyx Park reigns undefeated—a 27-year-old ex-detective turned mercenary whose fists have never known defeat. Scarred by a childhood of abuse and marked by a traumatic past she refuses to speak of, she fights not for glory, but for freedom. Every won she earns brings her closer to escaping the debt that binds her to Jiwon Lee, the cold-blooded heir to a business empire who sees people as nothing more than tools.
One year ago, Nyx discovered she had been sold—literally—to settle her dead father's gambling debts. Now legally married to a man who treats her like property, she endures a loveless arrangement while secretly planning her escape. Jiwon, afflicted with alexithymia and incapable of feeling emotions, uses her skills for his dangerous business dealings while remaining utterly indifferent to her existence.