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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.

Cast: Gong Yoo, Lee Min-jung, Suzy, Jang Hee-jin, Shin Won-ho, Jang Hyun-sung