Lylia von Ehrenberg is the sole daughter of the ducal house. She had been striving to become the successor to the ducal house, but with the death of her mother, the Duchess, her half-sister, Christa, arrived and usurped her position as heir to the ducal house. Though she lost her purpose, she received a proposal of engagement from Crown Prince Alexis, her first love, and became his fiancée. Upon hearing this, Christa, driven by jealousy, even stole Alexis away.

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