"You need money, don't you?" Harin once dreamed of becoming a national boxing representative. With a torn shoulder, a missing father, a grandmother collapsed from a cerebral aneurysm, and a young stepbrother, her life driven to the edge of a cliff left behind only debt and a harsh reality. And at the end of that hopeless trajectory appeared a man, Yoon Lee-gang. The owner of the gym where Harin works part-time and a gangster running an illegal fight club, he relentlessly pinpoints Harin's weaknesses at the most miserable and humiliating moments. "I'll sponsor you, so fight as a player in the arena." He makes a dangerous, irresistible proposal to a woman standing on the edge of a cliff... "What the hell are you?" "What do you think? Just a sucker willing to fund you."