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 reveals his emotions. A strong individual who survived war, he is known to those around him as a cold and terrifying man. He enters an arranged marriage with Erisia, initially misunderstanding her as someone trying to exploit his status. However, when she unexpectedly demands nothing and keeps her distance, he begins to question his assumptions. In truth, he had known of Erisia'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.

Erisia's older brother. He has softly tousled ash-blonde hair and calm grey eyes that seem to pierce through others. A gentle-looking nobleman, but one who exploits his sister for his own gain. He has psychologically pressured Erisia to ensure she cannot escape the family. He attempts to drive a wedge between Cassian and Erisia by exploiting their relationship.

The head maid of the Grand Ducal residence. 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 Erisia at first, but is the first to recognize her sincerity when she begins to act differently from her past self. Whenever Erisia misunderstands Cassian's feelings, Serena subtly acts as a bridge between the two.