I Will Become the Villain's Poison Taster

After waking up in the body of Giselle Rozevin, possibly the worst character from the novel, The Poisoned Apple, our protagonist has one goal: escape the original Giselle’s miserable fate of being poisoned to death by assassins while trapped in a prison cell. Thankfully and strangely, she finds out that poison is ineffective on her and that she can distinguish them by taste. Thus, having fallen out of favor with the good guys, Giselle uses her new unique skill to appeal to the villains. However, is joining hands with the villains really the right choice?