The best medicine is one that is not bitter and is easy for anyone to take. Ei Rin (Ying Ling) is a court lady who aspires to become a doctor. One day, when she begins selling medicinal tea in the imperial palace, she is summoned by the emperor, who is interested in her unusual formula. He asks her to make a bitter medicine easier to take for his sweet-tooth, and she is appointed as the emperor's personal doctor She is joyous that the emperor has taken a liking to her formula, however, it is short-lived when she is told that she will be promoted to the position of empress. "My goal is not to be a empress, but a doctor!"