They Called Me Rook

To avenge her family, she hid her face and became "Rook," a pit fighter living by the blade. She thought she was the hunter, but she was already prey for two apex predators: her commander, a holy knight obsessed with her as a stand-in for his dead fiancée, and his demonic teammate, a beautiful monster who saw through her disguise and claimed her as his own. When her secret is exposed and she's caught in their war, she sheds her disguise and claims her bloody crown. She is no one's prey, no one's substitute. This time, the whole kingdom will kneel before her... including them.