I! the Strongest Killer!

My daughter was seriously ill and the medical expenses were unimaginably expensive. As a killer, I had to resume my old career. Accidentally awakening the avatar and system, a god-level killer? You're just cannon fodder. Can you block my emperor's shot? The most secretive killer? There was no hiding from my Manhattan transit station. Sneak attack? Don't talk about martial ethics! The World makes you unable to move. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.