The Siren's Covenant

After the kingdom of Navia suffers defeat, the cowardly King Arthur Carter sacrifices women from his own realm to the invader Jaxson Kane in order to save himself and secure his throne. Unable to bear the incoming humiliation, Queen Sophia poisons herself shortly after giving birth. Before her death, she gives a final command: her newborn baby girl shall be raised as a boy under the name Elias Cole, and her true identity as a princess must be kept hidden. Growing up disguised as a prince, Elias Cole does everything to protect her biological sister Clara Cole. Nonetheless, the heartless king hands Clara Cole over to the Urai Empire as a tribute. Renouncing her princely title, Elias Cole chooses to become a slave and follows her sister into the hostile foreign land.