According to the Hwarang Segi, Mishil was the daughter of Lord Mijinbu and Lady Myodo, a sister of Queen Sado, the consort of Jinheung of Silla.
Due to her lineage, Mishil was a member of the jingol (진골; 眞骨), or the noble true bone caste.
As a result, Queen Sado, with the help of Mishil's lovers; Lord Sejong and General Seolwon, managed to get the support of the court to dethrone King Jinji.
They gained people's support after blaming him for Silla's defeat which resulted to famines.
[3] Additionally, her role as mother to her various sons and daughters is not acknowledged by either of these historical texts, only the Hwarang Segi.