The main leads were forced to get married to protect the male lead from another girl's husband who has power. He doesn't like the female lead because he grew up with her. She is the daughter of his mom's friend who died when she was young so his mother adopted her. He teased and messed with her since she was young but she never fought back. He wanted someone perfect and she was not it. He later found out that she's been secretly in love him which made him want to divorce her even more. (Source: asianfuse.net)