Billionaire's Secret Janitor Wife

Three years earlier, Olivia had pulled a man out of a car accident and saved his life. She is from a small town and moves to New York alone to make a living there. She comes across John, an elderly rich man who has collapsed from heatstroke, and helps him. Her father needs surgery and she has to find 100,000 dollars for it, so she agrees to John's proposal and marries his grandson Oliver almost as soon as they meet. Oliver runs the family's corporate group. Both of them agree to keep the marriage out of public view. Olivia says nothing about who she is and takes work as a cleaner at her husband's company. Laura is a senior executive who wants Oliver for herself, and she and the people around her humiliate Olivia there again and again. Olivia and Oliver grow closer, and he has been in love with her for a while by then. He also finds out that the girl who saved him at the car accident three years ago was Olivia. At a society banquet, Laura goes to Oliver's stepmother, and the two of them set up Olivia's mother, who also works as a cleaner.