The Low-Ranking Civil Servant Wants to Achieve Success (completed)

Reincarnated as a low-ranking civil servant in a doomed imperial department, I knew my fate was to die in the first battle of the coming war. To survive, I started helping the Crown Prince catch villains using my knowledge of the original plot. I just wanted a safe desk job, but now I'm the empire's youngest minister! Power tastes sweeter than I thought, and I'm not letting anything ruin my success—not even the Crown Prince if he tries to run away from his duties. I'll drag him back myself!