A different sort of fairy tale
We all grew up on classical fairy tales in which there is a king, a queen and a beautiful princess, a castle, and of course an evil witch - everything that children love. In these tales, the witch is generally ugly and always evil, and the princess is beautiful, gentle, loving and kind.
Generally, the princess finds herself in some kind of plight from which she needs to be rescued by a prince (who has recently fallen madly in love with her), or seven dwarfs, or a knight in shining armor.
This fairy tale, Who Is the Princess in the Mirror is a different sort of fairy tale, with an important moral that empowers and strenghts positive values.