Villain Son: Take Down the Protagonist's Sister at the Beginning

[Villain cool article + master and apprentice + ignoring luck + heaven-defying background + invincible horizontal push + decisive killing + imperial immortal seal] When he woke up, Qin Tian traveled to a fantasy world with outstanding talent, terrifying background, and fairy beauty. I thought I could live a happy life relying on my background, but I never thought that when the system awakened, I would turn out to be a villain? The protagonist whose cultivation was abolished by him and whose meridians were severed has returned strongly not long ago. Not only has his cultivation been restored, but it has even improved, and he also has a ring on his hand. Even my sister is the reincarnation of the Nine Heavens Sword Immortal. Soon she will awaken the wisdom of her previous life and open the gate of heaven with one sword. Facing the start of Tianbeng, fortunately Qin Tian has a system and obtained the heaven-defying skill "Yu Xian Seal". From immortals to mortals, as long as they hold the Imperial Immortal Seal, no matter what their level of cultivation, every move, life and death will be controlled by Qin Tian. Nine Heavens Sword Immortal? A reincarnated terrifying power? But... The beautiful woman in the ring, the terrifying power from the upper world? It's just... Faced with the resistance of the protagonist's master, Qin Tian directly placed the Imperial Immortal Seal and suppressed it forcefully... Teaching junior sister how to practice and being discovered by her master? Qin Tian directly placed the Imperial Immortal Seal and taught the other party to practice together...