Three years ago, Yun Yu and Qiao Xin had a one-night stand. At the same time, Qiao Xin's younger brother had a car accident and was in urgent need of a large sum of medical expenses. In order to raise the medical expenses, Qiao Xin's father sold the female protagonist to Lin Jiang. At a critical moment, the male protagonist showed up and saved the female protagonist. They agreed to get married, and the male protagonist put forward three conditions. If the female protagonist violated any of them, she would have to pay a breach of contract penalty of one billion yuan.
