A modern guy named William travels back in time and becomes a nobody son-in-law in the Great Qian Dynasty. Problem is, his father-in-law can hear his every thought. So much for being a lazy bum—now he’s stuck playing secret military advisor. He helps dodge political traps and even whips up a super cavalry using ideas his father-in-law snatches from his head. Together, they're ready to take over the world.