The Troublesome Princess

Vivi Heilon is stuck with the curse of reincarnation until she can find "True Happiness", which she thinks is absolute bullshit. She spends most of her days and lives lazing around; after some point. But then finally her life starts looking interesting.
"Why does this girl have so many enemies? Well, no problem, I'll just kill them all!"
Whenever anyone annoying gets in her way, she just kills them, which gives her the nickname "Cold Butterfly." In fact, she even ends up killing the emperor, so she makes her father emperor instead. But one day, she suddenly encounters the Archduke, "Alexander Solon." He gets on her nerves, yet every time she tries to kill him, she fails! So after 3 years, when she finally gives up, Alexander appears in her bedroom at night and says
"It's so disappointing, Vee. I thought you liked challenges, so why are you giving up on me?" He says, holding Vivi's chin with his fingers, making a cage of his body around her, "Please keep challenging me," and disappears.
"Wait What! You want me to challenge you. Bastard! You're interested in me, aren't you? I'll make you regret messing with me!"
And so begins the tale of an interesting romance and hatred!