La hermana de mi prometido me ama en secreto

Betrayed by her prince fiancé, Lily is saved by his sister, War Queen Rose. Lily feigns amnesia, the prince lies that she loves Rose instead. Unaware Rose has secretly loved Lily for ten years, Rose happily claims her for real. Empowered, Lily becomes a "Black Lily". Together, they awaken dragon magic, defeat traitors, and rule as Queens!