Gu Qiming, head of the Gu family, borrows money from a casino after his business fails. Unable to pay it back, he turns to mob boss Lin Moyu for a loan. Lin Moyu demands Gu Qiming's eldest daughter, Gu Yuxuan, as collateral. Gu Qiming agrees, then immediately runs off with Gu Yuxuan, leaving her younger sister, Gu Nuonuo, behind to pay the debt. After Lin Moyu captures Gu Nuonuo, she makes a bet with him so her sister won't be forced to become his mistress in the future...
