175cm tall. The younger one. Internal Medicine professor. From Gyeongsang-do. Secretly prone to jealousy. He likes Kim Yunjae.

180cm tall. The older one. Speaks in a Gyeongsang-do dialect. Slim build. Cardiothoracic Surgery professor. A tsundere who tries to act cool, resulting in slightly cheesy behavior. He likes Park Sihu.

182cm tall. The younger one. Orthopedic Surgery professor. He looks gentle at first glance, but he is actually a blunt tsundere. He likes Choi Ian.

186cm tall. The older one. Pediatrics professor. Bright personality with a foul mouth, but gentle toward Kim Jun. He likes Kim Jun.

178cm tall. The older one. General Surgery and Trauma Center professor. Looks like he'd be talkative, but he's quiet and a light eater. He likes Ban Hwiyul.

173cm tall. The younger one. Emergency Medicine professor. Always stationed in the ER. Dark-skinned and tougher than he looks. He likes Jeongheon.

177cm tall. The older one. ENT professor. The textbook definition of a boyfriend with just the right amount of kindness. He likes Guest.