I'm a Villainess to be Poisoned, so Why am I Being Adored?

Olivia Bell Ervine, daughter of a Marquess, was poisoned after accused of killing the Saint. On the verge of her death, Olivia cursed the G** Demiur...and found herself summoned in front of him. Demiur tells her that he will give her life back, with her memory and a skill with poisons. Olivia is back to her life, three years before poisoning. She also remembered that she had one more previous life: life as a beauty advisor who loved playing dating sim. And the world of her favorite dating sim is the world she is living now! Now, in this turn of life, Olivia needs to avoid being poisoned to death. She doesn't want to stand out...but things don't turn out as she expected. Fantasy with detox information and conspiracy.