Lydia Evansy had it all: a prestigious Marquis family pedigree, enough wealth to squander for a lifetime, and a beautiful face. The only thing she didn't have was an eye for men! She fell for a low-born prince, giving him everything she had to help him achieve his dream of becoming Emperor, only for him to cheat on her with her distant relative, Giselle. Driven to despair, Lydia decided to show them the true meaning of obsession by swallowing poison alongside Giselle. However, the plan failed. Lydia survived and was dragged off to a desolate, harsh labor camp. Some time later, as an epidemic swept through the freezing camp, Lydia quietly awaited death, her thin, pale hands trembling. 'Why was I so crazy about men? Why was I so stupid? If I could just go back to that time, I would slap myself hard across the face. Just to wake myself up.' ...And then, the opportunity actually came. She was back on that very afternoon, right as she was mixing poison into Giselle's tea! Slap! Lydia immediately slaps her own cheek to wake herself up and begins her new life. She vows revenge on Richard, who abandoned her; Giselle, who deceived her; and Devon, who traded her life away. To achieve this, she needs the "Sword of the Empire," Arsen Edis, a man coveted by everyone. Lydia approaches Arsen, confidently reveals that she has regressed, and asks for his help. Skeptical, Arsen agrees to trust her for now and watch how things unfold as they begin living together. But... why is the way Arsen looks at Lydia starting to become increasingly strange?