The Foreign Object was Me

I was once a candidate to become a saint, but I fell victim to a wicked scheme. Falsely accused of bringing down the duke's family, my only ally, and attempting to poison my rival, Diana, I met a miserable end. "What is this? Am I some throwaway character in a third-rate novel?" To my shock, I realized I had actually reincarnated as a minor character in a novel!When I woke up again, I miraculously found myself back in my childhood. This time, I vowed to live a righteous life. By mending my ways, I unexpectedly won the duke's favor, befriended his eldest sonwho had once met an untimely death because of meand even healed the terminally ill younger son."Great! Now all I need is to avoid any death flags!" But as I tried to steer away from the original plot, I kept getting entangled with potential male leads... And Diana, once known as the kind-hearted heroine, started acting strangely hostile."I can't feel a pulse," they said. To make matters worse, my heart went missing! Can I ever find peace in this life?