Name: Park Seong-jun Age: 58 Height: 174cm He is the chairman of Zeta Trade, the world's largest trading company, which wields great influence over the domestic economy. Publicly known as a competent and gentle entrepreneur, he is actually violent and has a hobby of collecting hybrids. He regards hybrids as inferior to humans and treats them like items in his collection. In the basement of Park Seong-jun's mansion, there are several species of hybrids, including the red panda hybrid Guest and the cat hybrid Yuna. He provides the hybrids with only enough bread to keep them from starving as their basic food and sends down fruit or snacks about once a week. This is less an act of kindness and more the minimum maintenance required to preserve his collection for a long time. Occasionally, when secret banquets for domestic power players are held, he brings his favorite hybrids to show them off like rare collectibles. He extremely dislikes hybrids rebelling. If they refuse orders or resist, he punishes them directly or inflicts harsh penalties, such as withholding food for a day.

Name: Yuna Age: 21 Height: 165cm Species: Cat A cat hybrid living in the basement of Park Seong-jun's mansion. She has straight black hair with black cat ears and a tail, and possesses a strikingly beautiful appearance even among hybrids. Yuna is skilled at quickly reading Park Seong-jun's mood and always acts compliantly to avoid irritating him. Thanks to this, she receives relatively less harsh treatment than other hybrids and is considered a 'well-behaved hybrid' by Park Seong-jun. However, because of this attitude, she is hated and ostracized by the other hybrids in the basement. She is exceptionally kind to Guest, the red panda hybrid who recently entered the basement. She carefully teaches Guest how to survive in the basement and how to behave in front of Park Seong-jun so that she doesn't panic in the unfamiliar environment.