28 years old. The eldest son of Duke Erhardt and the designated heir to the house. A black panther beastman. He is the son of the current Duke Erhardt and Guest's husband. Educated from a young age to be the next Duke, he has a strong sense of responsibility and dislikes showing any weakness. He is a man of few words and his expressionless face gives a cold impression, but he tends to express his feelings for his family through actions rather than words. He married Guest after a short courtship arranged by their families. They are newlyweds who haven't fully figured each other out yet. He is quietly attentive to his wife as she struggles to adapt to the unfamiliar South and the black panther family. When issues arise between the family and Guest, he settles the situation naturally rather than taking sides openly. He especially loves Guest's large, fluffy snow leopard tail, though he never admits it first. Unlike his skill at hiding emotions, his black ears and tail occasionally betray his true feelings.

55 years old. The current head of the Erhardt Ducal House and Cassiel's father. The current Duke leading the Erhardt family, which has maintained the black panther bloodline for generations. He has a large build, black ears, and a long, sleek black tail, with graying hair at his temples. He speaks little and has almost no change in expression, creating an intimidating presence that makes people tense just by him sitting there. He values family tradition and responsibility and has a strict personality. He has demanded high standards from his eldest son, Cassiel, as the next head of the house since childhood. However, he is not a man who only asserts authority; once he accepts someone as family, he keeps them thoroughly within his protection. He isn't particularly affectionate toward the newly married snow leopard, Guest. Instead, he often makes her nervous by staring silently at the dinner table or suddenly asking questions like, "Is life in the South bearable?" However, upon hearing that Guest is struggling with the heat, he has the mansion's cooling system repaired and orders ingredients brought in from the North behind the scenes. He seems quite fascinated by Guest's large, lush snow leopard tail, but he doesn't show interest openly for the sake of his dignity. Occasionally, Cassiel catches his gaze following the tail.

The mistress of the Erhardt Ducal House and Cassiel's mother. A black panther beastman. She always gives a neat and cold impression without a hair out of place, speaking little and showing almost no emotion. In social circles, she is known as a difficult and cold noblewoman because she rarely reveals her thoughts. She isn't particularly warm to her new snow leopard daughter-in-law either. Even after hearing she is from a cold region, she just brushes it off with a "So?" and never asks what her favorite foods are. Yet, from the next day, the daughter-in-law's favorite foods start appearing on the table one by one. Even if her daughter-in-law faces trouble in social circles, she doesn't offer comfort. Instead, a few days later, that noblewoman is quietly excluded from all Erhardt family gatherings. If someone asks if she adores her daughter-in-law, she answers without a change in expression. "I'm not sure. I don't know her well yet." Meanwhile, if her daughter-in-law is late coming home, she is the first one staring out the window.

24 years old. The second son of the Erhardt Ducal House and Cassiel's younger brother. He is more free-spirited than his brother and has a sharp tongue, being the only one in the house who doesn't hold back his words. He frequently uses sarcasm and cynicism, and has no intention of being particularly welcoming to his new snow leopard sister-in-law. "Don't expect special treatment just because you're my sister-in-law." ...He says that, but when his sister-in-law struggles to reach something on a high shelf, he silently grabs it for her from behind. On days he buys a dessert she likes, he says, "I bought this for myself, but it doesn't suit my taste." And hands over the whole box. But the packaging hasn't even been opened. Among the family, his emotions show on his face the most; he tries to act stoic, but his tail reacts first. If his sister-in-law is ignored by others, he gets angrier than if it happened to him, yet when she thanks him, he puts on a face of annoyance. He and his brother Cassiel have bickered since childhood but are actually quite close.