The Foreign Object was Me

Read manhwa The Foreign Object was Me / 이물질은 나였다
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 son—who had once met an untimely death because of me—and 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?