Transmigrated Villain: My Cousin Is a Reborn Female Emperor

[Villain + invincible + an outrageously powerful background + ignores fate and fortune + reborn female emperor + multiple women + ruthless] Qin Jiug e transmigrates into a fantasy world, blessed with double pupils, exceptional talent, and an unbelievably powerful background. Both his parents are reigning emperors. He thought he was starting out on the path to invincibility, but at the crucial moment, the System awakens, and he discovers he's actually a Villain? Not only has he secretly been cultivating forbidden demonic arts, he's also set his sights on his cousin, a Supreme Bone born into a collateral branch with no powerful backing? Faced with the temptation of the Supreme Bone, Qin Jiuge decisively refuses: “Double pupils already lead to invincibility. Why borrow my cousin's bone?” My name is Qin Xian'er. I have been reborn. In my previous life, Qin Jiuge dug out my Supreme Bone and exiled me to the Qin clan's ancestral grounds. Although I later grew a new Immortal Bone and became an emperor, I still wasn't his match. He stole my Immortal Bone, and even killed me. My end was utterly tragic. This time, I must be extremely careful, cultivate diligently, and make sure I kill him. But little by little, I realized that things were going increasingly off track...