From the Start, My Younger Sister's Chaos Blood Was Stolen

With double pupils, one already walks an invincible path. Why borrow another's bones? Thirty-three thousand years into the Desolate Domain, Chen Yuan transmigrates to another world and becomes the youngest Saint King in history. Just as his younger sister awakens the Chaos Sacred Body, he leaves alone for two years to find the Nine-Turn Reincarnation Herb, all so he can lay the foundations for her path to invincibility. But on the day he returns, his sister has been skinned and dismembered by their clan's Chaos Divine Child, who takes her Chaos blood, supposedly to secure a brighter future for himself. But what does your future have to do with my sister? Chen Yuan flies into a rage, and the System activates at just the right moment: [Choice One: Swallow your anger and accept humiliation. This System will disappear on its own.] [Choice Two: Take Chen Luoli and flee the Chen family. This System will reward you with the Sunflower Manual.] [Choice Three: Overthrow the Chen family and burn every enemy in the world to ashes. This System will reward you with the Chaos God-Demon Body!] Faced with the choices, Chen Yuan erupts in fury. “The pain inflicted on my family today will be repaid a hundredfold!”