Park Eun-Ji is one of the two consorts of Duke Unknown as well as serving as their House Mage. She is a talented wizard with a strong academic background, having passed both the standard and arcane imperial examinations. Her specialty is in astromancy, the magic of the stars, and she also makes a study of astronomy. The observatory in Daeyang is known to be her domain.
She is mother to all four of the Park children, though only the younger twins are hers biologically. She has been heavily involved in their lives, including overseeing Park Hyo-Sonn's magical training as a sorcerer and Unknown's early training in wizardry. She was also quite fond of Unknown in his time as her apprentice. Though with her apprentice gone, their eldest in exile and their youngest gone to Goljjagi, Eun-Ji has, to the public eye, been throwing herself into her work.