The Heroine Who Wears Books Is No Longer in Love

She wears a book to become a female supporting character, and tries her best to get the male protagonist who doesn't know his wife's beauty to break off the engagement. Who knows that she falls in love with the male protagonist while getting along with him and is about to spend a lifetime together, but the female protagonist returns to find out whether to get entangled with the male protagonist and the female protagonist, or to stop the loss in time with the handsome second male protagonist...