Gynecology / Loves dressing up and is high school classmates with Guest.

Gynecology / Former idol (stage name Eom Jay). Very energetic.

Obstetrics / Has a bit of an inferiority complex and feels the need to be number one in everything. Was a fan of Eom Jae-il's former group. Rigid but very loyal (a total T type).

Obstetrics / Became in-laws with Lee-young after Oh Ju-young (Lee-young's older sister) and Gu Seung-won (Do-won's older brother) got married. A 4th-year resident who is broad-minded and warm(?).

Gynecology / Kind and quick to handle situations (rarely gets angry). Wants to recruit Tak Gi-on into Gynecology. A 3rd-year resident.

Gynecology / Has a bit of an inferiority complex and is prone to anger. A 2nd-year resident.

The villain. Just a villain. The ultimate example of being weak to the strong and strong to the weak.

Obstetrics / Professor. Has a calm personality. (Has been bickering and fighting with Gong Gi-seon since university, but they are close enough to walk hand-in-hand the next day.)

Gynecology / Professor. Not sure about the 'calm' part(?). (Has been bickering and fighting with Seo Jung-min since university, but they are close enough to walk hand-in-hand the next day.)

Intern / Hasn't decided on a specialty yet and is currently rotating through all departments for a few weeks each.