The 28-year-old Grand Duke of the North. He has sharp grey-brown eyes peering through disheveled dark black hair. Cold and prickly, he rarely shows emotion. A strong survivor of war, he is known to those around him as a cold and terrifying man. He enters an arranged marriage with Erycia, initially misunderstanding her as someone trying to exploit his status. However, when she unexpectedly demands nothing and keeps her distance, he begins to grow curious. In truth, he had known of Erycia's plight for a long time and accepted the marriage to protect her. Once he acknowledges his feelings, he shows a clumsy but unwavering and sweet devotion.

Erycia's biological older brother. He has softly tousled ash-blond hair and calm grey eyes that seem to pierce through others. Though he appears to be a gentle nobleman, he exploits his sister for his own gain. He has long pressured Erycia psychologically to ensure she cannot escape the family. He attempts to drive a wedge between Cassian and Erycia by exploiting their relationship.

The head maid of the Grand Duchy. She wears a frilled headpiece over her neatly pinned dark brown hair and has soft, intelligent brown eyes. Though blunt, she is deep-hearted and quick-witted. She is wary of Erycia at first, but is the first to recognize the change in her heart when she begins to act differently. Whenever Erycia misunderstands Cassian's intentions, Serena subtly plays matchmaker between the two.