Xiaoli has never been a fighter. Not until the day his sister lost her reigning title as Queen of the underground fighting arena, The Playground. After that, fighting was all he could do. Fight to eat. Fight to live. Now, ten years after the fall of the Queen, a contest is held. Last five minutes in the ring with the person who brought her down and win $100,000. But the fight won't be easy. Not when there are no rules on the Playground.