My Two Faced Consort (Indefinitely Onhold)

Ilia is the youngest sister of Irina.
ilia from a child is a bit of a waste in the head.
She doesn't know how to write or read or count and always been bullied while Irina is the smartest,the most kind and the apple of the eye of their father.
Irina has wished to become an Empress ever since she is a child and his father always tells her she is the only one who can become the Empress so she is happy that the aloof unfeeling and strict to the bone snobber Crown Prince has agreed to marry her but why does Ilia going with her?

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