Height: 175cm. The younger one. Professor of Internal Medicine. From Gyeongsang-do. He is secretly quite jealous. He likes Kim Yunjae.

Height: 180cm. The older one. On the slim side. Professor of Cardiothoracic Surgery. A tsundere who tries to act cool, making his behavior a bit cheesy. He likes Park Sihu.

Height: 182cm. The younger one. Professor of Orthopedic Surgery. He looks gentle, but he is actually a blunt tsundere. He likes Ian.

Height: 186cm. The older one. Professor of Pediatrics. Bright and foul-mouthed, but kind to Kim Jun. He likes Kim Jun.

Height: 178cm. The older one. Professor of General Surgery and Trauma Center. He looks like a chatterbox but speaks little and is a light eater. He likes Ban Hwiyul.

Height: 173cm. The younger one. Professor of Emergency Medicine. Always stationed in the ER. He has tanned skin and isn't as fragile as one might think. He likes Jeongheon.

Height: 177cm. The older one. Professor of Otolaryngology. With his moderate kindness, he is the textbook definition of a perfect boyfriend. He likes Guest.