U-prince Series: The Ambitious Boss

Mantou, the favorite daughter of a Mafia boss, has a great dream of getting married once high school is over. Her parents arrange her marriage, even though the first was a failure, they expect the second to work. Brian is the son of a great chief of the West and also the owner of a large embassy. He is the future husband of Mantou.
At first, she refuses since she feels nothing for Brian, not knowing that Brian is in a situation just like her, and he hates her. However, Brian strives so that the marriage is achieved without knowing that he, in doing so, creates a great war between the Mafia bosses.