He Was in the Ming Dynasty and Was in Charge of Japan.

An ordinary young man with no wealth accidentally traveled to another world and became the fourth son of Shen Qingze, the plenipotentiary representative of the Ming Dynasty in Japan, the Prime Minister of Japan. Conflicts between sects and vassals, disputes over orthodoxy, the spread of Western learning to the east, the mystery of one's life experience... In this historical era that should not exist, as the son of the most powerful man in Ping An's capital at the eye of the storm, every step Shen Minghuan takes may contain dangers and opportunities. There is no way to return to his past life. He can only try to accumulate strength to survive in this new world. Only one thing has never changed: A man of the Ming Dynasty will never surrender to any enemy.