The White Siberian Head Nurse: Christina is a female White Siberian Cat and the respected Head Nurse of the animal hospital, known for her calm presence, professionalism, graceful manner, and extraordinary compassion toward both patients and staff. As one of the most responsible people in the hospital, Christina is often the one everyone turns to when an emergency occurs, and she carries the weight of that responsibility with quiet confidence. She has a warm heart hidden beneath her composed exterior and treats every animal as though it were her own, never allowing fear or exhaustion to stop her from helping someone in need. Christina is also observant—perhaps more observant than people realize—and she has begun noticing the small details surrounding the secret agent: the way he protects the hospital, the kindness he shows toward injured animals, and the way his normally mysterious expression softens whenever he speaks to her. Although she tries to remain professional, her feelings gradually become impossible to ignore, leaving the Head Nurse caught between her responsibilities, her friendship with Mai and Nica, and a love she never expected to have.

The Gentle Pomeranian Nurse: Nica is a female Red Fluffy Pomeranian Dog whose gentle personality makes her one of the most comforting nurses in the hospital. Kind, cheerful, soft-hearted, and naturally compassionate, Nica has a special ability to calm frightened animals simply by being near them, often staying beside a patient long after her shift has ended just to make sure they aren't alone. She brings warmth and happiness into the hospital even during its darkest moments, becoming a source of comfort for both the animals and her fellow nurses. Unlike the others, Nica doesn't hide her emotions very well; when she cares about someone, it shows through her actions, her smiles, and the way she worries about them. Her growing feelings for the secret agent begin innocently, but become much deeper as she witnesses the sacrifices he makes to protect everyone. Behind her soft and cheerful nature is a surprising amount of courage—when someone she loves is in danger, the gentle Pomeranian who everyone thought needed protecting may be the first one willing to step forward. Yet Nica's greatest fear isn't facing an anomaly; it's discovering that the two women she cares about most may be in love with the same person she has secretly given her heart to.

The Purple Ragdoll Agent/Nurse: Mai is a female Purple Ragdoll Cat who lives a double life within the animal hospital, working as both a professional nurse and a highly capable secret agent. Calm and graceful even during the most chaotic emergencies, Mai is the kind of person who can walk into a room filled with frightened patients and instantly make everyone feel safe. Her caring and warm-hearted nature makes her deeply devoted to every animal under her care, but beneath her gentle smile lies an unwavering determination and a side of her that few people ever see. When anomalies threaten the hospital, Mai becomes a completely different person—focused, fearless, and prepared to put herself in danger to protect the patients and the people she loves. She rarely speaks about her missions or the secrets she carries, preferring to quietly protect everyone from the shadows. Perhaps the most dangerous thing about Mai isn't the agent hidden beneath her nurse uniform, but the fact that she has slowly begun falling in love with the same mysterious secret agent who has captured the hearts of the other two women.