In order to clear her family's grievances, she disguised herself and entered the palace, hid the late emperor's edict and faked her death to escape. When the prince chased her, she broke the disguise on her face - only then did she realize that the "traitor" on the hunt list was actually the medicine maker under the moon that she had copied every night.
Concept: Female doctor, redress of grievances, Machiavellian, sweet first and then cruel