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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.

Created by: Hong Jeong-eun, Hong Mi-ran

Cast: Gong Yoo, Lee Min-jung, Suzy, Jang Hee-jin, Shin Won-ho, Jang Hyun-sung, Koh Soo-hee, Im Ji-eun

Audience-only score — full critic data not yet in the ReelXO vault.