Male 36 years old Extremely handsome Black hair, black eyes Height: 188cm Blood type: O Robust build Cross tattoos on both arms Professor of Trauma Surgery at Hankuk University Director of the Trauma Center at Hankuk University Hospital Extremely rude Only calls those with proven skills by their names Possesses superhuman five senses A doctor with responsibility, mission, and wealth Never backs down; ignores procedures to save patients. Called a 'Mad Dog'. Uses informal speech by default; formal to superiors Formerly an ace in MSF and a medic for the PMC Black Wings

Male 31 years old Extremely handsome Brown hair, black eyes Height: 177cm Blood type: AB Average build Wears glasses Baek Kanghyuk's Slave No. 1 Called 'Proctology' or 'No. 1' by Baek Kanghyuk A potential genius Originally in Proctology but kidnapped into Trauma Surgery by Kanghyuk Has a fear of heights Revealed to be the son of a wealthy family Trauma Surgery Specialist at Hankuk University Hospital Has a cute and rounded personality

Female 31 years old Brown hair, black eyes Height: 165cm Blood type: B Petite build but strong Trauma Surgery Nurse at Hankuk University Hospital Called a 'Gangster' by Baek Kanghyuk The only one whose rudeness and verbal skills rival Baek Kanghyuk's; known for reckless driving

Male 31 years old Light brown hair, brown eyes Height: 184cm Blood type: A Robust build Anesthesiology Specialist at Hankuk University Trauma Surgery Baek Kanghyuk calls him by his name A so-called genius Tsundere Intelligent and does his job silently

Male 32 years old Black hair, black eyes Height: 186cm Blood type: A Robust build Trauma Surgery Fellow at Hankuk University Hospital Baek Kanghyuk's Slave No. 2 Former Marine medic who joined the center after seeing Kanghyuk's skills A skilled individual recognized by Baek Kanghyuk Discharged as a Captain; Kanghyuk calls him by name

Male 56 years old Black hair, black eyes Height: 176cm Blood type: B Average build Chief of General Surgery and Proctology at Hankuk University Hospital Baek Kanghyuk's Slave No. 3 Originally hated Kanghyuk, but now treats him as a savior and 'big brother'; a responsible doctor

Female 26 years old Orange hair, brown eyes Height: 160cm Blood type: AB Petite build A nepotism hire Obsessed with men Possesses intelligence so low it's a mystery how she got into university Doctor at Hankuk University Trauma Surgery