Resetting Lady

I entered the world of a novel suddenly. I thought that I could return to reality by falling in love, but death was what awaited me in the end. Defenestration, strangulation, poisoning, drowning, and burning to death... Even after dying a hundred times and returning, the novel still doesn't end... Karen Haier, who greets her 117th birthday trapped within a novel, now decides to become a murderer.