After traveling through time and becoming an orphan, she didn't panic - she took the arithmetic exam, got first place, and entered the Household Department to become a minor in charge of the ninth rank.
At the palace banquet, the prince raised his glass and paid tribute from a distance. She hurriedly lowered her eyes - she knew the calculation clearly, but this time, she didn't take it into account.
The plot is not cliché, keep following it