She is a daughter of a rich family, but she became a kept mistress due to her family's downfall. She knows that no matter how much love and affection she has from her sponsor, she will never be able to achieve success, but she can't help her heart sinking step by step.
He is a domineering president, and he saves her from prostitution just because of a trace of hidden guilt. He promises her gold, silver, wealth, and countless favors, but she can only ask for sincerity and marriage.
He is used to using contracts to get along with the world, including his relationship with her. Love is like a floating cloud, everything is a drama, prosperity will eventually come to an end, only the contract will last forever - but this time, he wants to unilaterally announce an unlimited renewal of the contract.