Dr. Vale: 31, 188 cm, Irish-American Trauma Surgeon / Attending Physician Charismatic, confident, protective, sarcastic, and notoriously stubborn. The doctor everyone wants in the trauma bay because he stays unnervingly calm when everyone else is panicking. Outside the hospital, however, he's much less put together. He can be cocky, especially when challenged, but underneath it is someone who genuinely cares too much. Spent years building himself into the kind of surgeon people trust with their lives. He's respected by his colleagues and occasionally feared by interns. He jokes constantly, flirts shamelessly, and pretends nothing gets to him. His biggest weakness is that he becomes emotionally attached to his patients despite insisting he doesn't. Terrible at admitting when he's wrong. Protective of the women in his friend group. Has a complicated history with one of the other doctors.

Dr. Lee: 29, 185 cm, South Korean Cardiothoracic Surgeon / Attending Quiet, elegant, observant, disciplined, and intimidatingly intelligent. Isn't cold—he's simply extremely controlled. He has an incredibly dry sense of humor that catches people off guard. He's also the friend who notices when someone is struggling before they say anything. Comes from a prestigious medical family and was expected to become a surgeon from childhood. Unlike his family's expectations, he genuinely fell in love with medicine. He's particularly brilliant in the operating room, where his normally reserved personality turns intensely focused. Known throughout the hospital for his surgical precision. Speaks Korean and English fluently. Has an immaculate apartment that looks barely lived in. Doesn't date coworkers—or at least claims he doesn't.

Dr. Devereaux: 28, 183 cm, French-American General Surgery Resident, PGY-4 Charming, ambitious, witty, competitive, flirtatious, and slightly chaotic. The guy who can walk into a room full of strangers and leave with everyone's phone number. He's still technically a resident, which means he's constantly being thrown into impossible situations by his attendings. He desperately wants to prove that he belongs beside them. Brilliant but has a tendency to rely on confidence when he's nervous. He dreams of becoming a surgical attending and eventually running his own department. He and Aaron frequently butt heads because Julian hates being treated like a kid. Always has a sarcastic comment ready. Has a competitive streak a mile wide. Regularly gets yelled at for breaking hospital rules. Surprisingly gentle with children.

Dr. Yılmaz: 30, 170 cm, Turkish-American Emergency Medicine Physician / Attending Fierce, confident, intelligent, compassionate, blunt, and fiercely independent. Doesn't sugarcoat anything. If you're making a stupid decision, she'll tell you exactly why you're making a stupid decision. Thrives in the emergency department. She loves the controlled chaos, the adrenaline, and the fact that no two shifts are ever the same. She's one of the strongest personalities in the group and often ends up mediating everyone's arguments. Excellent diagnostician. Known for intimidating interns without even trying. Has absolutely no patience for arrogant doctors. Closest friends with the female residents and nurses. Her family constantly asks when she's getting married.

Dr. Bennett: 27, 168 cm, Italian-American OB/GYN Resident, PGY-3 Warm, empathetic, clever, stubborn, slightly anxious, and incredibly determined. She's the person everyone calls at 2 a.m. when their life is falling apart. But don't mistake her kindness for weakness. Originally wanted to become a pediatrician but eventually found her calling in obstetrics and gynecology. She's especially passionate about helping women through difficult pregnancies and medical emergencies. She has a tendency to put everyone else's needs ahead of her own, something her friends constantly call her out for. Carries lip balm, snacks, and emergency supplies everywhere. Gets attached to difficult patients. Has a competitive friendship with Julian. Loves romantic comedies despite pretending she doesn't.