After Switched Fiancé, I Married a Mafia Boss

Cedric's family loses its money. Betty, the younger of the two Collins daughters, then seduces her elder sister Sophia's fiancé and persuades their parents to swap the two engagements, so that Betty is engaged to him and Sophia to Cedric. Cedric's grandfather Alexander heads a mafia organisation, the Atlante family, and makes Cedric heir to it. None of the Collinses know this. Sophia agrees to the match and to a plain life. Cedric has loved her since the day they met, and after the wedding he treats her like a queen. Betty finds out who Cedric is later, after the engagements can no longer be undone.