Cross

Kim Hyung-beom

Jae-hyun

Kang In-gyu, a genius first-year resident doctor working in the organ transplant department of Sunrim Hospital who graduated atop of his class all throughout medical school and passed his doctor's licensing exams with a perfect score.

Son Yeon-hee, the daughter of the hospital chairman. She is a first-year fellow doctor and a maternity specialist.

Lee Joo-hyuk, an organ transplant specialist.