Looking for a novel

I'm looking for the book of a Demon or Dragon God who ruled over a known universe, he is killed by his 11 or 7 generals and he is reincarnated as a human whose name is Jacob.
Jacob still has the consciousness of his former life as a Demon or Dragon God, he has reincarnated into a feeble you man who is married to a woman who is trying to keep her family business from being overtaken, so Jacob helps her with the formula for her perfume or medicine? And the well-known Noble-prize winning doctor asks to be his pupil and he refuses... I could go on but.
Please help me find the name of this novel.

Try .. medical masters world.

It should be the book you're looking for.