National Preceptor, Please Behave Yourself!

She is a top assassin of the 21st century. One day, she transmigrates into the body of the most useless wastrel in the Chancellor's household. She was born the legitimate daughter, noble by status, yet fell into the dirt and became someone anyone could bully. When she opens her eyes again, she gains a secret manual, takes on powerful foes, and kicks every obstacle out of her way as she rises, writing a dazzling legend. But why does the supremely talented, wickedly charismatic young State Preceptor cling to her from the very first meeting? Hey, State Preceptor, please have some self-respect!