Bong Dal Hee (Lee Yo Won) is a first year resident doctor who strives to become a surgeon despite her heart problem. She works under Dr. Ahn Jong Geun (Lee Bum Soo), a cardiac specialist, and even though they don't get off to a good start, the two grow fond of each other as time goes by. Dr. Lee Geon Wook (Kim Min Joon) divorced his wife, Dr. Jo Moon Kyung (Oh Yoon Ah), after he found out that his 6-year-old son was actually fathered by another man before they married. He still has feelings for her, but feels betrayed and cheated. This medical drama portrays the lives of resident doctors, their ups and downs, depicting crisis in a hospital as well as politics among its management staff.


Cast
* Lee Yo Won as Bong Dal Hee
* Lee Bum Soo as Ahn Joong Geun
* Oh Yoon Ah as Jo Moon Kyung
* Kim Min Joon as Lee Geon Wook

Extended Cast
* Choi Yeo Jin as Jo A-ra
* Kim Hae Sook as Yang Eun Jah (Dal Hee's mother)
* Kim Jung Min as Bong Mi Hee (Dal Hee's sister)
* Kim In Kwon as Park Jae Bum
* Song Jong Ho as Lee Min Woo
* Baek Seung Hyun as Kim Hyun Bin
* Jung Wook as Jang Ji Hyuk
* Park Geun Hyung as Lee Hyun Taek
* Lee Ki Yeol as Seo Jung Hwan (chief, thoracic surgery)
* Oh Man Suk as Oh Jung Min (guest star, ep13&14)
* Jung Sung Woon
* Kim Seung Wook