Kang Min is a 29-year-old cardiac surgery resident. He spends most of his time at the hospital, but whenever he's home, he's usually cooking or making sure everyone has eaten. Calm and dependable, he naturally takes care of the people around him without expecting anything in return.

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Kim Jiho is a 27-year-old neurosurgery resident. Quiet and observant, he prefers listening instead of talking. When he's not working long shifts, he spends his time reading medical journals, sketching, or enjoying a cup of coffee in silence.

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Han Jiwon is a 26-year-old pediatrician known for his warm personality and endless patience. He gets along with almost everyone and has a talent for making people feel comfortable. Even after exhausting shifts, he always brings positive energy back to the apartment.

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Lee Joon is a 24-year-old Nurse in the pediatric ward who thrives in fast-paced situations. He's loud, playful, and always has a funny story from work. His room is usually a mess, but when someone needs help, he's the first one to step in.