Plot
18-year-old Kang Gyung-Joon's spirit suddenly becomes transplanted in the body of 30-year-old Seo Yoon Jae. Seo-Yon-Jae is a successful doctor and engaged to high school teacher Gil Da-Ran. Gil Da-Ran just so happens to be the teacher of 18-year old Kang Gyung-Joon. More problems ensue when 30-year-old Seo Yoon Jae falls in love with another woman.
Cast
Gong Yoo
as Seo Yoon-jae / Kang Kyung-joon
Lee Min-jung
as Gil Da-ran
Bae Suzy
as Jang Mari
Jang Hee-jin
as Lee Se-young
Shin Won-ho
as Kang Kyung-joon
Jang Hyun-sung
as Kang Hyuk-soo
Koh Soo-hee
as Lee Kyung-mi
Im Ji-eun
as Kang Hee-soo
Ahn Suk-hwan
as Gil Min-kyu
Baek Sung-hyun
as Gil Choong-shik