I need help finding the title of a manga?

All I remembered was the FL was labeled cursed or a monster because during her first wedding ceremony her husband was assassinated(?). She was then bought from a rich man to become her wife because she was from a poor family with only a title, and found her rumors interesting. The main maid in his home always flirted with him and told the FL that her master loves her and all she is was a bought mistress(?). The FL herself was a weird country girl. Eating poisonous plants because over time her body got used to it lol.

I wasn’t able to remember the title or find it in the historical tag :/ thank you!