The Evil Prince And His Precious Wife: The Sly Lady (lightnovelheaven-com)

A story of time-travel. Sly and cunning, she unexpectedly became a sickly noble lady whose fiancé is merciless and demotes her to a lowly concubine. She sneers and bravely breaks off the engagement. To hell with scumbags, marry heirs to lords, blind the courts with her brilliance. But, my Lord, we agreed that we are o…