Sir, Please Respect Yourself!

She is the top killer of the 21st century, and she once traveled through time to the most useless good-for-nothing in the Prime Minister's Mansion. She was originally a legitimate young lady with a noble status, but she fell into pieces and could be bullied by everyone. When she opened her eyes again, she obtained the secret book, fought against the strong, kicked away the stones blocking the way to promotion, and wrote a legend of amazing talent and beauty. But why did the talented, charming and crazy young national master pester her the first time they met? Hey, Master Imperial Master, please respect yourself!