The Fake Eunuch's Secret

A modern soldier king travels through time, becoming a palace servant awaiting punishment. He escapes, and with a system, remains in the deep palace disguised as a young eunuch. He awakens the Beauty Catalog System. By earning favor from consorts and princesses, he receives gifts like a powerful physique and martial arts manuals. In the treacherous palace, he uses the system's power to resolve crises, carving out a place in the inner court.