After Time Travel, I Became the Emperor’s Son-in-Law

The country is sliding toward collapse and the palace is full of plots. The princess's husband is treated at court as a man of no use. The man in that position is a scientist from the present day with two doctorates. An experiment of his went wrong and blew up, and he woke from it in an ancient dynasty as the imperial son-in-law. He has modern medicine and modern science in his head. He brings out surgical tools and equations and uses them to break up the schemes in the palace and to rebuild the state's strength. The princess has no warmth for him at first, and he sets about changing that with what he knows.