Big (2012)
Watch movie18-year-old Kang Kyung-Joon's spirit suddenly becomes 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. Gil Da-Ran just so happens to be the teacher of 18-year old Kang Kyung-Joon.