Yūri Kei is the Assistant Secretary of the Department of Finance, having worked under Kijin Ko for a long time. He knows Kijin's true name and is one of the few who knows what he looks like. He is also a contemporary of Reishin and Yuushun, and failed the examination to become an official during the year that Kijin had taken the exam, though Yuuri eventually got used to seeing Kijin's face and managed to pass the exam the next year.

(Source: Wikipedia)