PLEASE GIVE ME SPOILERS [thinking in reverse / walk in my shoes] webnovel / manwha !! aka [revenge, empathy]

Please please please give me complete spoilers for the webnovel / manwha called “thinking in reverse” but also known as “walk in my shoes” or “revenge” or “empathy” !!!!! i wanna know the ending and all the bad stuff that happens. i can’t read dark psychological stuff unless i’m prepared and i know what happens beforehand so i can’t even decide whether to read it or not unless i get spoiled first. please help me out!