Seowangmo

The Queen Mother of the West and the Goddess of Death, she is Habaek's mother, a beautiful woman who is centuries old. She is the Goddess of Punishment, Torture, and disease, though ironically, she is also the Goddess of Love and Beauty. Her vast lands contain the Divine Orchard, where a rare peach tree grows with fruit that can grant a human 18 000 years of life. Habaek also does not appear to get along with her, though she seems to only want her son to be happy and wishes to protect him from the Emperor at all costs.

(Source: Wikipedia)