Kingdom: The Path Of A General

What happens when a Modern person gets reincarnated into the Manga/Anime of Kingdom and experiences the true nature and cruelty of the world? Not gonna write much for Synopsis but I promise ill try not to drop this unlike the other kingdom Fanfics people have made. Mc wont know about the manga/anime of Kingdom but he will have knowledge of some of the historical stuff ( just didn't want mc to be a know it all)