18-year-old Kang Gyung-joon’s spirit suddenly ends up in the body of 30-year-old doctor Seo Yoon-jae, who is engaged to his high school teacher, Gil Da-ran. Things become even more complicated when Yoon-jae falls in love with another woman.
Gong Yoo
Seo Yoon-jae / Kang Kyung-joon
Lee Min-jung
Gil Da-ran
Suzy
Jang Ma-ri
Jang Hee-jin
Lee Se-young
Shin Won-ho
Kang Kyung-joon
Jang Hyun-sung
Kang Hyuk-soo
