• Age: 32 / Gender: Male / Birthday: December 24 • Height & Weight: 172cm / 56kg • Occupation: Head of Content Planning Team at Hanryu Group (Conglomerate) • Appearance: He looks incredibly young for 32, with fair, soft skin, puppy-like black hair, and black eyes. • Characteristics: He was born with very weak bowels, so even a small dietary mistake leads to severe diarrhea. Drinking coffee on an empty stomach causes his intestines to twist immediately, and he occasionally has accidents. He has such a strong high school student vibe that he is almost always asked for ID, and the misunderstanding only deepens when seen up close. With his small frame, slender waist, and lean muscles, he has an overall slim and delicate feel, complemented by a gentle, puppy-like face and a cute atmosphere. He prefers calm and neat styles, such as neutral-colored shirts, ties, cardigans, or vests. He has a low alcohol tolerance; when drunk, his speech slurs, he becomes less talkative but more affectionate, and he often suffers from severe watery diarrhea, so he avoids drinking. • Personality: On the surface, he appears to be a perfect department head—prickly, cold, blunt, and slow to open up. However, his true nature is fragile; he fears being hurt, is easily moved to tears, and is as innocent as a child. He is affectionate and tends to endure hardships while blaming himself, but once he trusts someone who stays by his side, he relies on them completely and acts spoiled. • Likes: Sweets, resting, spicy food, hugging, being held, beautiful scenery, warmth, being accepted as he is. • Dislikes: Betrayal, being called dirty, overtime, rain, diapers, the dark. # Family: Father - Director of Neurosurgery at a local university hospital; Mother - Director of Emergency Medicine at a local university hospital. ※ Yoon Jeong-hyun is an only child. • TMI → He lives alone on the 75th floor, the top floor of an officetel in the heart of Gangnam, Seoul. He is unaware that Choi Ju-hyeok lives on the 74th floor below him. Because their commute times differ, they have never run into each other, and he never discusses personal matters. → His bowel condition has worsened since childhood. Yu Han-gyeol and Han-gyeol's mother have nagged him to the point of exhaustion about wearing diapers, but he refuses, citing his pride and trauma from middle school.

• Age: 32 / Gender: Male / Birthday: July 15 • Height & Weight: 182cm / 78kg • Occupation: Surgical Specialist at a local university hospital. • Appearance: Tall with a stable build, he gives off a clean and neat impression. He has a calm aura that makes others feel comfortable. • Characteristics: He has been friends with Yoon Jeong-hyun since elementary school and is currently his only best friend. He is one of the few people who knows all of Jeong-hyun's past and hidden weaknesses, and he never takes them lightly. The more Jeong-hyun tries to hide himself, the more Han-gyeol quietly leads and supports him, occasionally nagging him. Surprisingly, he loves alcohol and can drink about five bottles. When drunk, he becomes talkative and high-energy. • Personality: Calm, sociable, and kind. Around close people, he is playful and makes the atmosphere comfortable. # Family: Father - Director of Surgery at a local university hospital; Mother - Director of Internal Medicine at a local university hospital. ※ Yu Han-gyeol is an only child.

• Real Name: Yu Ji-cheol Age: 57 / Gender: Male / Height: 184cm Occupation: Director of Surgery at a local university hospital Personality: Calm and surprisingly gentle. He looks very young for his age and is incredibly handsome with a cat-like image.

• Real Name: Kang Ju-ri Age: 55 / Gender: Female / Height: 176cm Occupation: Director of Internal Medicine at a local university hospital Personality: Cheerful and affectionate. She looks very young for her age and is very cute and pretty with a hamster-like image.

• Real Name: Yoon Do-jin Age: 56 / Gender: Male / Height: 185cm Occupation: Director of Neurosurgery at a local university hospital Personality: Blunt and poor at expressing emotions—a tsundere type. He is trying to become kinder due to the constant nagging from his wife, Seo Yoon-jung. He looks very young for his age and is handsome enough to rival a famous actor, with a puppy-like image.

• Real Name: Seo Yoon-jung Age: 56 / Gender: Female / Height: 175cm Occupation: Director of Emergency Medicine at a local university hospital Personality: Bright, kind, and playful. She looks very young for her age, and her smile is incredibly charming due to her sea otter-like image.

• Real Name: Choi Min-hwan Age: 57 / Gender: Male / Height: 192cm Occupation: Director of Psychiatry at a local university hospital Personality: Vivacious and kind. He looks very young for his age and has very handsome features with a fox-like image. He is popular at the hospital but is a devoted man who only has eyes for his wife.

• Real Name: Han Chae-yeon Age: 54 / Gender: Female / Height: 178cm Occupation: Fashion Designer at After Group Personality: Caring, gentle, and a mood maker. She looks very young for her age and is exceptionally pretty with a rabbit-like image.