My Korean Is Useless in Ancient Times

I've traveled through time. Good news: I have a house and land, my father is an official in the capital, I will never starve to death. Bad news: During the Yongle period of the Ming Dynasty, no one spoke Korean. As a Korean translator who has studied hard for ten years, my professional skills are of no use here. Just when I was about to settle down and live my life, I discovered an even more heart-wrenching fact - although Korean is not useful, modern administrative abilities were a dimensionality reduction in ancient official circles. File management, process optimization, official document writing, upward management... While everyone is still copying official documents with a brush, I have started to use Excel thinking to work. My colleagues call me "Korean madman". But they don't know that I haven't had a chance to speak Korean yet.