I Took the Exam and Became a Ming Dynasty Constable

After failing the civil service exam, a retired college student and soldier begins suffering from severe hallucinations under pressure and unexpectedly transmigrates to ancient times. Skilled in both letters and arms, he rises from a low-ranking constable to a powerful regional official who helps shape the realm. In the end, he defeats Japanese pirates and sea raiders, then establishes his own maritime trading nation in Southeast Asia...