Marriage Crisis novel (Mary and Randall)

Mary is a housewife who is always busy with her husband and daughter every day.
She is a typical family woman, with no job, no money and completely devoted to her family. However, on the day Mary's daughter had a high fever, she found out that her husband had another woman and they were still having a baby. She finally divorced her husband and was empty-handed.
In the saddest and most disappointing moment, Marry accidentally saves the injured CEO - the only heir to the Davis family, the richest man in A city. With his help, Marry decides to get back his fortune and real life. Execute your plan step by step.