The Young Master of the Pavilion

A modern person transmigrates into an unfamiliar dynasty and becomes the eldest son of the prefect's family.

Before he can even get a taste of life as a young master, he is thrown into prison and made a prisoner.

Fortunately, he has an unbelievably powerful deduction System. He tackles one crisis after another, saving himself and protecting his family along the way.

With this extraordinary ability, he helps his adoptive father rise to the highest rank of grand chancellor and carves out a carefree life for himself as a young master in ancient times.

(P.S. Not for historical accuracy buffs. A no-brainer wish-fulfillment story.)