Gil Da Ran works as a substitute teacher while trying to get her degree in education. Although she comes from an average family, she’s just not having it easy until she slips and falls while delivering a bouquet of flowers to her ex-classmate who didn’t invite her to her wedding. Seo Yoon Jae, a doctor, saves her and a whirlwind romance ensues. Soon, Gil Da Ran is engaged to a kind and handsome doctor and it is a but her happiness is short-lived as a month before the wedding, Yoon Jae becomes very cold towards her.
At that point in time,Da Ran meets an 18-year-old transfer student from the United States, Kang Kyung Joon who’s a very cheeky and smart boy. By chance Kyung Joon gets into a car and motorcycle accident with Yoon Jae and the two of them plunge into deep waters. Yoon Jae being the heroic doctor swims deeper to save Kyung Joon but in the process, they switch souls.
In the hospital, Kyung Joon wakes up in Yoon Jae’s body and the drama begins. Kyung Joon slowly falls for Da Ran while trying to fool everyone into believing he’s Yoon Jae. Yoon Jae on the other hand is lying comatose in Kyung Joon’s body, in the hospital he works at.
Seo Yoon Jae / Kang Kyung Joon (Gong Yoo)
Gil Da Ran (Lee Min Jung)
Jang Ma Ri (Bae Suzy)
Kang Kyung Joon (Shin Won Ho)
Gil Choong Shik, Da Ran’s brother (Baek Sung Hyun)