I Wandered into the Prince’s Manor and Became His Beloved

As the princess consort's younger sister, of course she takes care of everything herself. That includes disguising herself as her elder sister and entering the prince's manor to serve its cold and ruthless master. In her eyes, her elder sister is an angel. But she never imagined that her angelic sister would want to destroy her with her own hands, to send her straight to hell. After barely surviving, how could she possibly go back to the way she was? Of course she'll send her sister to the grave. But wait, something's not right. What's with that prince? Can't he let go of her elder sister? On the very first day after her sister's death, he proposes to her? Hmph! What a shameless man! He has her elder sister in his heart, yet he still has to come after her. If she can't fight him, surely she can run away? She always thought the prince loved her elder sister. She had no idea that she was the moonlight in his heart all along.