This System Lets Me Kill the Protagonist

What should I do if I travel to a world where demons are rampant and everyone is in danger? Waiting online. "Ding! Congratulations on getting..." Great, the system is here! What? You said that the world is facing collapse, and it's because the child of destiny in this world has turned dark? What? You want me to kill him? ! Okay, but as a system, why are you so timid when it comes to him? This system is definitely not a serious system. Wait, it's not a personal act, right? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.