

10.065 minSeason 1 • Episode 16
Latest18-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.
Acting
Gong Yoo's teenager mannerisms in a grown man's body
Writing
Hong sisters' trademark banter before it got repetitive
Trivia, insights & behind the scenes
This was Gong Yoo's first drama after military service, directly leading to his Coffee Prince resurgence. The Hong sisters specifically wrote it for him.
The body-swap trope peaked in 2012 K-dramas; Secret Garden had just ended, and this rode that wave with a teacher-student twist that sparked real debate about consent framing in Korean media.