Raking in the Perks: I, the Emperor, Am a Professional!

Li Jue, Prince of Jin, keeps a group of spendthrift subordinates and is constantly fretting over expenses, until he comes across a gifted young man with a brilliant turn of phrase and striking good looks.

The young man is efficient and asks for nothing in return. Just as Prince Jin decides to keep taking advantage of him, he discovers that the young man is actually a girl, with a formidable father behind her, the sort of major figure who commands the whole martial world.