The Black-Bellied Heir’s Daily Life

After transmigrating, the cunning and scheming woman finds herself in the body of a frail heiress afflicted with a deadly chill poison. Her fiancé, driven by greed, demotes her to a lowly concubine. She gives a cold laugh, breaks off the engagement, dumps the scumbag, and marries the heir, dazzling the court officials.

But, Your Lordship, we agreed this was just a scheme to manipulate people. Why are you making the charade real? Hey, hey, don't go back on your word!