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.
Gong Yoo
Seo Yoon-jae / Kang Kyung-joon
Lee Min-jung
Gil Da-ran
Suzy
Jang Mari
Jang Hee-jin
Lee Se-young
Shin Won-ho
Kang Kyung-joon
Jang Hyun-sung
Kang Hyuk-soo
Koh Soo-hee
Lee Kyung-mi
Im Ji-eun
Kang Hee-soo
Ahn Suk-hwan
Gil Min-kyu
Baek Sung-hyun
Gil Choong-shik
Shin Ji-soo
Lee Ae-Kyung
Yoon Hae-young
Lee Jung-Hye
