I Invented a First Love and Drove Four Rich Boys Crazy

I woke up as the villainess in a romance novel. Win the arrogant heir's heart, collect $15 million, go home. Easy—until I learned our relationship was a bet. So I planted a diary about a secret crush: one of his three best friends. Now all four want answers. Then the novel's heroine arrives with a stolen design and a deadly trap. My plan was to break his heart. Why is he willing to lose everything to win mine?