Entering the Apocalypse with the Code of the Undead

I learned that I had terminal cancer just after I traveled through time, so didn't I travel through time in vain? Ning Chuan was puzzled, so he picked up a hoe and went to dig the ancestral grave of his evil boss. Who knew that ghosts really existed in this world! A pale old face met Ning Chuan's eyes... At the critical moment, a "Code of the Undead" appeared in his mind!