As the ace heart surgeon of Seomoon Jaeil Hospital, Dr. Yoon Haejun always puts her patients first. To give them even better care, she hopes to open a heart transplant center on the premises. But when one of her patients goes AWOL and saddles the hospital with his bills, the whole project is put in jeopardy. Her only hope? Become the fake girlfriend of the wealthy hospital chairman Seo Yihan! But as Dr. Yoon will soon learn, melting his frigid heart may be more difficult than operating on one!