I Don't Want to Be the Crown Princess.

Synopsis

Japanese in her previous life, Lidi is a duke's daughter in this life. Her fiancé is the Crown Prince, Freed, who is known for being flawless. "No matter how beautiful he is, I absolutely don't want to marry a polygynous royal!" Troubled, Lidi came up with an outrageous plan for the sake of breaking off the engagement!It's a thrilling romance where schemes and fate cross!!(Source: Ichijinsha, translated)