18-year -old Kang Gyung-Joon's spirit suddenly become's transplanted in the body of 30-year -old Seo-Yoon-Jae. Seo-Yoon-Jae is a successful doctor and engaged to high school teacher Gil-Da-Ran just to happens to be the teacher of 18-year-old Kang-Gyung-Joon. More problems ensure when 30-year-old Seo-Yoon Jae falls in love with another woman.
