Elsword character. A fox spirit that was sealed inside the a hairpin currently worn by Ara Haan. She saved Ara from Ran during his razing of her village, and continues to be with her in exchange for the promise of freeing her from the seal. In Ara's awakening, Eun's presence takes over and changes Ara's physical appearance to closer match that of Eun's, giving her multiple fox tails, white hair, sharper red eyes, and red whisker marks on her face (and in the Shakti line, fox ears).
In the path of Little Specter > Asura > Shakti, Eun can manifest herself without taking over Ara's body.