My answer was wrong. Between 03 and 05, there was indeed a novel called " The Bright Moon Dynasty ". It was a physical pirated book. I'm not sure about the name of the main character. It might be a character named Zhang Hui. The online version of the book was called " Crossing the Radiant Moon Empire ". It told the story of Zhang Hui's transmigration to the Radiant Moon Empire. Thank you for your advice.