Fantasy: Rebirth with system, it's reasonable that I'm invincible

[Rebirth + Brain Hole + Invincible + Dark Belly + Multiple Female Protagonists (Three) + Decisive Killing + Treacherous] Ji Wuchang was reborn and returned to the time before the duel with Xiao Fan! And awakened the sign-in copy system! The system has only two functions, one is sign-in, and the other is copy! Sign-in every day will get rewards! Copying means copying the opponent's things, including skills, combat skills, secret skills, life span, root bones, elixir, comprehension, etc.! The misery of the last life was caused by Xiao Fan. This life will start from defeating Xiao Fan and open a new chapter! Impermanence is asking for life, who dares to stay! Once you encounter impermanence, everything is empty! The Tianjiao cried: Since I was born with impermanence, why was I born! ...