Stand-In Bride's Seduction: Harlequin comics

Pretending to be his fiancée… What kind of plot is this?
Rina, a dispatch secretary, was dumped by her fiancé of five years one week before her wedding. Suffering from a wounded heart, Rina accepts an invitation from her twin sister, Sara, to come to Isla Sagrado—a country on the other side of the world. When Sara meets Rina there, she shoves a letter into Rina’s hand and then immediately flees. Inside the letter is an expensive ring and a written plea for Rina to pose as her sister. “How can she ask me to deceive her fiancé when she knows mine just broke up with me?” To make matters more difficult for Rina, the fiancé, Reynard, is essentially royalty, and he’s a gorgeous millionaire!