The Strongest Part-Timer: Awakening in Another World

What miracles might happen if the human brain were developed and utilized to 100%? Transmigration? Control over space and time? Ruling the world? All right, you've got it all wrong! He's just a down-and-out young master who works as a housekeeper, plays the miracle doctor and the charlatan, and even moonlights as a live-in son-in-law, all to make money on the sly, get by in the city, and fight his way through another world...