One of my friends recommended a story to me and I already forgot the name and he doesnt remember either. The story is basically; MC gets reincarnated/woke up as a strong dude (political or physical wise). MC gains the memories of the previous hosts body and starts to do shit. There was no harem. Thats something I remember clearly.
I don't think this is the one you are looking for, but this might be similar; https://www.royalroad.com/fiction/28601/arrogant-young-master-template-a-variation-4
Ah no, as far as I am aware, the novel is an original, and has unfortunately been dropped. Btw, if you are going to read it, the story is really entertaining until about cp50, after which it went downhill (I assume that the author ran out of ideas at that point before finally dropping it).